#include <bits/stdc++.h>

using namespace std;

int main() {
    int n, m;
    cin >> n >> m;

    cout << "YES\n" << 2 * m << "\n";

    while (m--) {
        int a, b;
        cin >> a >> b;
        vector<int> f, s;
        for (int i = 1; i <= n; i++)
        {
            if (i != a && i != b) f.push_back(i);
        }
        f.push_back(a), f.push_back(b);
        s = f;
        reverse(s.begin(), s.end());
        swap(s[0], s[1]);
        for (int i: f) cout << i << " ";
        cout << "\n";
        for (int i: s) cout << i << " ";
        cout << "\n";
    }
}