#include <bits/stdc++.h>

using namespace std;
int n, m;
int main()
{
    cin >> n >> m;
    cout << "YES\n";
    cout << 2*m << "\n";
    while (m--) {
        int a, b;
        cin >> a >> b;
        vector<int> sor;
        sor.push_back(a), sor.push_back(b);
        for (int i=1; i<=n; i++) {
            if (i!=a && i!=b) sor.push_back(i);
        }

        for (auto x:sor) {
            cout << x << " ";
        }
        cout << "\n";

        swap(sor[0], sor[1]);
        reverse(sor.begin(), sor.end());

        for (auto x:sor) {
            cout << x << " ";
        }
        cout << "\n";
    }
    return 0;
}