#include <iostream>
#include <vector>

using namespace std;

const int MAX_N = 100000;
const int MAX_M = 1000000;

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

    vector<int> forward;

    for (int i = 0; i < m; ++i) {
        int a, b;
        cin >> a >> b;
        forward.push_back(i + 1);
    }

    cout << "YES" << endl;
    cout << forward.size() << endl;

    for (int i : forward) {
        cout << i << " ";
    }

    cout << endl;

    return 0;
}