#include <iostream>
#include <vector>

using namespace std;


vector<vector<int>> graph;
vector<int> result, used;

void pleaseKillMe(int v) {
    used[v] = 1;

    for (auto child : graph[v]) {
        if (used[child] == 0) {
            pleaseKillMe(child);
        }

        if (used[child] == 1) {
            cout << "No";
            exit(0);
        }
    }
    result.push_back(v);

    used[v] = 2;
}

int main() {

    size_t n, m;

    cin >> n >> m;

    graph.resize(n);
    used.resize(n, 0);

    for (size_t i = 0; i < m; i++) {
        size_t from, to;
        cin >> from >> to;

        graph[to - 1].push_back(from - 1);
    }

    for (size_t i = 0; i < n; i++) {
        if (used[i] == 0) {
            pleaseKillMe(i);
        }
    }

    cout << "Yes\n";

    for (auto soldier : result) {
        cout << soldier + 1 << ' ';
    }

    return 0;
}