#include<iostream>
#include<string>
#include<vector>

#define rep(i,n) for(i=0; i<n; i++)

using namespace std;

int main()
{
    int n;
    cin >> n;
    
    int i,j;
    vector<int> renchon(n,0);
    string s;
    rep(i,n) {
        rep(j,n) {
            cin >> s;
            if(s=="nyanpass") {
                renchon[j]++;
            }
        }
    }
    int max=0,specific=-1;
    rep(i,renchon.size()) {
        //cout << renchon[i] << endl;
        if(renchon[i]>max) { max=renchon[i]; specific=i+1;}
        else if(renchon[i] == max) { specific=-1;}
        else {}
    }
    cout << specific << endl;
    return 0;
}