package me.yukicoder.lv1; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class No0239 { public static void main(String[] args) { try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) { int N = Integer.parseInt(br.readLine()); int[] greet = new int[N]; int ans = -1; int cnt = 0; for (int i = 0; i < N; i++) { String[] str = br.readLine().split(" "); for (int j = 0; j < N; j++) { if (str[j].equals("nyanpass")) { greet[j]++; } } } for (int g : greet) { if (g == N - 1) { ans = g + 1; cnt++; } } System.out.println(cnt == 1 ? ans : -1); } catch (IOException e) { e.printStackTrace(); } } }