#include <iostream>
#include <vector>
using namespace std;

int main()
{
    cin.tie(nullptr);
    cout.tie(nullptr);
    ios_base::sync_with_stdio(false);

    int n, m;
    cin >> n >> m;
    vector<vector<int>>vec(n + 1);
    vector<int>vec2(n + 1);
    for (size_t i = 0; i < m; i++)
    {
        int a, b;
        cin >> a >> b;
        vec[a].push_back(b);
        vec2[a]++;
    }
    int mk = 0, mh = 0, lh = 0;
    for (size_t i = 1; i < n; i++)
    {
        for (int j : vec[i])
        {
            lh += vec2[j];
        }
        if (lh > mh)
        {
            mk = i;
            mh = lh;
        }
        lh = 0;
    }
    if (mh == 0) cout << -1 << endl;
    else cout << mk << " " << mh << endl;
}
/*
10 9
1 2
2 4
1 3
3 5
5 7
5 8
5 9
3 6
6 10
-3 4
*/