#include <bits/stdc++.h>

using namespace std;
const int maxn=1605; 

int n,m;
int ecnt; 
vector<pair<int,int>> g[maxn+5]; 
vector<int> cnt[maxn+5][maxn+5];
vector<pair<int,int>> ans;
int sta[maxn*maxn+5],top;
int cur[maxn+5],vis[maxn+5];
bool flg[maxn*maxn+5],flg2[maxn*maxn+5]; 

void dfs(int u) {
    vis[u]=1; 
    for (int &i=cur[u];i<g[u].size();i++) {
        int v=g[u][i].first,w=g[u][i].second;
        if (w<0) {
            if (flg2[-w]) continue ; 
            flg2[-w]=1; 
        }
        else {
            if (flg[w]) continue ; 
            flg[w]=1; 
        }
        dfs(v); 
        if (w>0) sta[++top]=w; 
    }
}
void makeswap(int u,int v) {
    ans.emplace_back(u,v); 
    swap(A[u],A[v]); 
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cin>>n>>m;
    for (int i=1;i<=n;i++) {
        for (int j=1;j<=m;j++) {
            int t;
            cin>>t;
            int id=(i-1)*m+j; 
            A[id]=t; 
            cnt[i][t].emplace_back(id); 
        }
        
        for (int j=1;j<=m;j++) {
            if (cnt[i][j].size()==0) {
                g[i].emplace_back(j+n,--ecnt); 
            } else if (cnt[i][j].size()>=2) {
                for (int k=0;k<cnt[i][j].size()-1;k++) {
                    g[j+n].emplace_back(i,cnt[i][j][k]); 
                }
            }
        }
    }
    int lst=n*m+1; 
    for (int i=n+1;i<=n+m;i++) {
        if (!vis[i]) {
            top=0; 
            dfs(i);
            if (top==1) continue ; 
            makeswap(sta[top],lst);
            for (int j=top;j>=2;j--) makeswap(sta[j-1],sta[j]);
            makeswap(lst,sta[1]);
        }
    }
    for (int i=1;i<=n*m+1;i++) {
        cout<<A[i]<<' '; 
    }
    cout<<'\n'; 
    cout<<ans.size()<<'\n';
    for (auto [x,y]:ans) cout<<x<<' '<<y<<'\n'; 
    return 0; 
}

answer.code: In function ‘void makeswap(int, int)’:
answer.code:33:10: error: ‘A’ was not declared in this scope
   33 |     swap(A[u],A[v]);
      |          ^
answer.code: In function ‘int main()’:
answer.code:45:13: error: ‘A’ was not declared in this scope
   45 |             A[id]=t;
      |             ^
answer.code:71:15: error: ‘A’ was not declared in this scope
   71 |         cout<<A[i]<<' ';
      |               ^