package no239; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); String[][] m = new String[n][n]; for(int i=0;i<n;i++) { for(int j=0;j<n;j++) { m[j][i] = sc.next(); } } int renge = -1; for(int i=0;i<n;i++) { boolean flag = true; for(int j=0;j<n;j++) { if (i == j) { continue; } if (!m[i][j].equals("nyanpass")) { flag = false; break; } } if (flag) { if (renge == -1) { renge = i + 1; }else{ renge = -1; break; } } } System.out.println(renge); } }