#include<bits/stdc++.h>
using namespace std;
int main(){
    int N; cin >> N;
    string nyan[N][N];
    int cnt = 0; 
    vector<int> v;
    int key1, key2;
    for(int i=0; i<N; i++){
        for(int j=0; j<N; j++){
            cin >> nyan[i][j];
            if(nyan[i][j] == "nyanpass"){
                cnt++;
                if(i == 0) key1 = j+1;
                if(i == 1) key2 = j+1;
                v.push_back(j);
            }
        }
    }
    if(cnt == N || cnt == N-1){
        for(int i = 0; i<N; i++){
            if(v[i]+1 == key1){
                cout << key1 << endl;
                break;
            }
            if(v[i]+1 == key2){
                cout << key2 << endl;
                break;
            }
            cout << -1 << endl;
            break;
        }
    }else{
        cout << -1 << endl;
    }
    return 0;
}