//yukicoder No.239 にゃんぱすー
#include <iostream>
#include <cstdio>
#include <string>
#include <algorithm>
using namespace std;
const int MAX_N = 100;
#define rep(i,n) for(int i=0;i<n;i++)
int main(){
	int n; cin>>n;
	int ans;
	string a[MAX_N][MAX_N];
	rep(i,n){	//input
		rep(j,n){
			cin>>a[i][j];
		}
	}
	rep(i,n){	//summer
		rep(j,n){
			if(a[i][j]=="nyanpass"){
				if(ans==i-1){
					ans=-1;
					break;
				}
				ans=i-1;
			}
		}
	}
	if(ans==0){
		cout<<"-1"<<endl;
	}else{
		cout<<ans<<endl;
	}
	return 0;
}