#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
ll N, M;
cin >> N >> M;
vector<vector<ll> > adjList(N);
for (ll i = 0; i < M; i++) {
ll u, v;
cin >> u >> v;
adjList[u].push_back(v);
adjList[v].push_back(u);
}
cout << N << endl;
for (ll i = 0; i < N; i++) {
cout << i << " " << (i + 1) % N << endl;
}
}
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