/**
 *    author: sunkuangzheng
 *    created: 26.01.2025 17:32:53
**/
#include<bits/stdc++.h>
#ifdef DEBUG_LOCAL
#include <mydebug/debug.h>
#endif

#include <algorithm>

#include <vector>

namespace atcoder {

namespace internal {

template <class T> struct simple_queue {
    std::vector<T> payload;
    int pos = 0;
    void reserve(int n) { payload.reserve(n); }
    int size() const { return int(payload.size()) - pos; }
    bool empty() const { return pos == int(payload.size()); }
    void push(const T& t) { payload.push_back(t); }
    T& front() { return payload[pos]; }
    void clear() {
        payload.clear();
        pos = 0;
    }
    void pop() { pos++; }
};

}  // namespace internal

}  // namespace atcoder

#include <cassert>
#include <limits>
#include <queue>
#include <vector>

namespace atcoder {

template <class Cap> struct mf_graph {
  public:
    mf_graph() : _n(0) {}
    mf_graph(int n) : _n(n), g(n) {}

    int add_edge(int from, int to, Cap cap) {
        assert(0 <= from && from < _n);
        assert(0 <= to && to < _n);
        assert(0 <= cap);
        int m = int(pos.size());
        pos.push_back({from, int(g[from].size())});
        int from_id = int(g[from].size());
        int to_id = int(g[to].size());
        if (from == to) to_id++;
        g[from].push_back(_edge{to, to_id, cap});
        g[to].push_back(_edge{from, from_id, 0});
        return m;
    }

    struct edge {
        int from, to;
        Cap cap, flow;
    };

    edge get_edge(int i) {
        int m = int(pos.size());
        assert(0 <= i && i < m);
        auto _e = g[pos[i].first][pos[i].second];
        auto _re = g[_e.to][_e.rev];
        return edge{pos[i].first, _e.to, _e.cap + _re.cap, _re.cap};
    }
    std::vector<edge> edges() {
        int m = int(pos.size());
        std::vector<edge> result;
        for (int i = 0; i < m; i++) {
            result.push_back(get_edge(i));
        }
        return result;
    }
    void change_edge(int i, Cap new_cap, Cap new_flow) {
        int m = int(pos.size());
        assert(0 <= i && i < m);
        assert(0 <= new_flow && new_flow <= new_cap);
        auto& _e = g[pos[i].first][pos[i].second];
        auto& _re = g[_e.to][_e.rev];
        _e.cap = new_cap - new_flow;
        _re.cap = new_flow;
    }

    Cap flow(int s, int t) {
        return flow(s, t, std::numeric_limits<Cap>::max());
    }
    Cap flow(int s, int t, Cap flow_limit) {
        assert(0 <= s && s < _n);
        assert(0 <= t && t < _n);
        assert(s != t);

        std::vector<int> level(_n), iter(_n);
        internal::simple_queue<int> que;

        auto bfs = [&]() {
            std::fill(level.begin(), level.end(), -1);
            level[s] = 0;
            que.clear();
            que.push(s);
            while (!que.empty()) {
                int v = que.front();
                que.pop();
                for (auto e : g[v]) {
                    if (e.cap == 0 || level[e.to] >= 0) continue;
                    level[e.to] = level[v] + 1;
                    if (e.to == t) return;
                    que.push(e.to);
                }
            }
        };
        auto dfs = [&](auto self, int v, Cap up) {
            if (v == s) return up;
            Cap res = 0;
            int level_v = level[v];
            for (int& i = iter[v]; i < int(g[v].size()); i++) {
                _edge& e = g[v][i];
                if (level_v <= level[e.to] || g[e.to][e.rev].cap == 0) continue;
                Cap d =
                    self(self, e.to, std::min(up - res, g[e.to][e.rev].cap));
                if (d <= 0) continue;
                g[v][i].cap += d;
                g[e.to][e.rev].cap -= d;
                res += d;
                if (res == up) break;
            }
            return res;
        };

        Cap flow = 0;
        while (flow < flow_limit) {
            bfs();
            if (level[t] == -1) break;
            std::fill(iter.begin(), iter.end(), 0);
            while (flow < flow_limit) {
                Cap f = dfs(dfs, t, flow_limit - flow);
                if (!f) break;
                flow += f;
            }
        }
        return flow;
    }

    std::vector<bool> min_cut(int s) {
        std::vector<bool> visited(_n);
        internal::simple_queue<int> que;
        que.push(s);
        while (!que.empty()) {
            int p = que.front();
            que.pop();
            visited[p] = true;
            for (auto e : g[p]) {
                if (e.cap && !visited[e.to]) {
                    visited[e.to] = true;
                    que.push(e.to);
                }
            }
        }
        return visited;
    }

  private:
    int _n;
    struct _edge {
        int to, rev;
        Cap cap;
    };
    std::vector<std::pair<int, int>> pos;
    std::vector<std::vector<_edge>> g;
};

}  // namespace atcoder

using ll = long long;
const int N = 5e5+5;
using namespace std;
int T,tt,tp,ti,n,m,u,v,w,dfn[N],low[N],st[N],vis[N],be[N],mx[N],mn[N],cnt; 
vector<pair<int,int>> g[N],ge[N]; map<int,short> p[N]; vector<int> sta;
void cmx(int &x,int y){x = max(x,y);}
void cmn(int &x,int y){x = min(x,y);}
void dfs(int u,int f){
    dfn[u] = low[u] = ++ti,vis[u] = 1,st[++tp] = u;
    for(auto [v,w] : g[u]) if(v != f){
        if(!dfn[v]) dfs(v,u),low[u] = min(low[u],low[v]);
        else if(vis[v]) low[u] = min(low[u],dfn[v]);
    }if(low[u] == dfn[u])
        for(++tt;;) if(vis[st[tp]] = 0,be[st[tp]] = tt,st[tp --] == u) break;
}int hd[N];
void dfs(int u){
    for(int &i = hd[u];i < ge[u].size();i ++) 
        if(auto [v,id] = ge[u][i]; !vis[id]) vis[id] = 1,dfs(v); 
    sta.push_back(u);
}int main(){
    ios::sync_with_stdio(0),cin.tie(0);
    cin >> n >> m;
    for(int i = 1;i <= m;i ++) cin >> u >> v >> w,
        g[u].emplace_back(v,w),g[v].emplace_back(u,w);
    dfs(1,0);
    for(int i = 0;i <= tt;i ++) mx[i] = -1e9 - 1,mn[i] = 1e9 + 1;
    for(int i = 1;i <= n;i ++)
        for(auto [v,w] : g[i]) if(be[i] == be[v])
            cmx(mx[be[i]],w),cmn(mn[be[i]],w);
    int id = 0;
    for(int i = 1;i <= tt;i ++) if(mx[i] - mn[i] > mx[id] - mn[id]) id = i;
    cout << mx[id] - mn[id] << "\n"; 
    int u = 0,v = 0,U = 0,V = 0;
    vector<pair<int,int>> gr(1);
    for(int i = 1;i <= n;i ++) for(auto [j,w] : g[i])
        if(be[i] == id && be[j] == id && w == mx[id]) u = i,v = j;
    for(int i = 1;i <= n;i ++) for(auto [j,w] : g[i])
        if(be[i] == id && be[j] == id && w == mn[id] && minmax(i,j) != minmax(u,v)) 
            U = i,V = j;
    for(int i = 1;i <= n;i ++) for(auto [j,w] : g[i]) 
        if(be[i] == id && be[j] == id && i < j) gr.emplace_back(i,j);
    int k = gr.size() - 1,i0 = 0,i1 = 0;
    atcoder::mf_graph<int> G(n + 2 + 2 * k);
    int s = 0,t = n + 1 + 2 * k;
    for(int i = 1;i <= k;i ++){
        auto [x,y] = gr[i];
        if(minmax(x,y) == minmax(u,v)){
            G.add_edge(s,i+n,2),i0 = i,
            G.add_edge(i+n,x,1),G.add_edge(i+n,y,1);
        }else if(minmax(x,y) == minmax(U,V)){
            G.add_edge(i+n,t,2),i1 = i,
            G.add_edge(x,i+n,1),G.add_edge(y,i+n,1);
        }else{
            G.add_edge(x,i+n,1),G.add_edge(y,i+n,1);
            G.add_edge(i+n,i+n+k,1);
            G.add_edge(i+n+k,x,1),G.add_edge(i+n+k,y,1);
        }
    }assert(i0 && i1);
    int res = G.flow(s,t);
    assert(res == 2);
    memset(vis,0,sizeof(vis));
    auto E = G.edges();
    for(auto [u,v,c,f] : E) if(f)
        if(u <= n && v <= n + k) p[u][v - n] |= 1;
        else if(v <= n && u <= n + k) p[v][u - k] |= 2;
    for(auto [u,v,c,f] : E) if(f && u > n && u <= n + k && v > n + k && v <= n + 2 * k){
        int id = u - n;
        auto [u,v] = gr[id];
        if(p[u][id] != 3 && p[v][id] != 3) ge[u].emplace_back(v,cnt),ge[v].emplace_back(u,cnt ++);
    }ge[u].emplace_back(v,cnt),ge[v].emplace_back(u,cnt ++);
    ge[U].emplace_back(V,cnt),ge[V].emplace_back(U,cnt ++);
    for(int i = 1;i <= n;i ++) assert(ge[i].size() % 2 == 0);
    cout << cnt << "\n";
    dfs(U);
    reverse(sta.begin(),sta.end()),sta.pop_back();
    for(int u : sta) cout << u << " ";
    cout << "\n";
}