#include <bits/stdc++.h>
#define endl '\n'
#define int long long
using namespace std;
typedef pair<int, int> PII;
const int N = 1000010;
int p[N];
int a[N];
unordered_map<int, int> st;
int find(int x)
{
    if (p[x] != x)
        p[x] = find(p[x]);
    return p[x];
}
vector<int> ans[N];
vector<int> res;
vector<int> r;
unordered_map<int, int> mp;
unordered_map<int, int> w;
void solve()
{
    int n, m, k;
    cin >> n >> m >> k;
    for (int i = 1; i <= n; i++)
        p[i] = i;
    for (int i = 1; i <= k; i++)
    {
        cin >> a[i];
        st[a[i]] = 1;
    }
    vector<PII> op;
    while (m--)
    {
        int x, y;
        cin >> x >> y;
        if (st[x] == 1 && !st[y])
        {
            st[x] = 2;
            ans[y].push_back(x);
            if (!mp[y])
            {
                mp[y] = 1;
                r.push_back(y);
            }
        }
        if (st[y] == 1 && !st[x])
        {
            st[y] = 2;
            ans[x].push_back(y);
            if (!mp[x])
            {
                mp[x] = 1;
                r.push_back(x);
            }
        }
        if (!st[y] && !st[x])
        {
            op.push_back({x, y});
        }
    }
    int x = 0;
    for (int i = 1; i <= n; i++)
    {
        if (!st[i])
        {
            x = i;
            break;
        }
    }
    if (x == 0)
    {
        cout << "No" << endl;
        return;
    }
    int cnt = 0;
    // sort(op.begin(), op.end());
    for (auto [x, y] : op)
    {
        if (find(x) > find(y))
            swap(x, y);
        if (find(y) != find(x))
        {
            if (!st[x])
            {
                st[x] = 1;
                res.push_back(x);
            }
            ans[x].push_back(y);
            ans[y].push_back(x);
            p[find(y)] = find(x);
            cnt++;
        }
        if (cnt == n - k - 1)
            break;
    }
    if (cnt < n - k - 1)
    {
        cout << "No" << endl;
        return;
    }
    for (int i = 1; i <= k; i++)
    {
        if (st[a[i]] != 2)
        {
            cout << "No" << endl;
            return;
        }
    }
    cout << "Yes" << endl;
    for (auto x : r)
    {
        if (!st[x])
        {
            st[x] = 1;
            res.push_back(x);
        }
    }
    cout << res.size() << endl;
    queue<int> heap;
    heap.push(res[0]);
    while (!heap.empty())
    {
        int o = heap.front();
        w[o] = 1;
        heap.pop();
        // cout << ans[o].size() << " ";
        vector<int> q;
        for (auto p : ans[o])
        {
            if (w[p])
                continue;
            q.push_back(p);
        }
        if (q.size() == 0)
            continue;
        cout << o << " ";
        cout << q.size() << " ";
        for (auto p : q)
        {
            cout << p << " ";
            if (ans[p].size() > 0)
                heap.push(p);
        }
        cout << endl;
    }
}
signed main()
{
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    int T = 1;
    // cin >> T;
    while (T--)
        solve();
    return 0;
}