//Dost SEFEROĞLU
#include <bits/stdc++.h>
#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")
using namespace std;
#define int long long
#define pii pair<int,int>
#define ff first
#define ss second
#define sp << " " <<
#define all(cont) cont.begin(),cont.end()
#define vi vector<int>
const int MOD = 1e9+7,inf = 2e18;
const int N = 2e5+50,Q = 2e5+50;
const int B = 500;
void solve() {
int n,m;
cin >> n >> m;
vi deg(n+1,0);
for (int i=1;i<=m;i++) {
int a,b;
cin >> a >> b;
deg[a]++,deg[b]++;
}
if (m > n-1) {
cout << "NO\n";
return;
}
cout << "YES\n";
cout << 1 << '\n';
cout << 1 << '\n';
}
signed main() {
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#ifdef Dodi
freopen("in.txt","r",stdin);
freopen("out.txt","w",stdout);
#endif
int t = 1;
//cin >> t;
while (t --> 0) solve();
}
