import java.util.*;
import java.lang.*;
import java.io.*;
 
class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		int[][] x = new int[n][n];
		for(int i = 0; i < n; i++) {
			for(int j = 0; j < n; j++) {
				x[i][j] = in.nextInt();
			}
		}
		for(int i = 0; i < n; i++) {
			for(int j = i; j < n; j++) {
				if(x[i][j] == 1) System.out.println((i+1) + " " + (j+1));
			}
		}
	}
}
 

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NQowIDEgMCAxIDEKMSAwIDAgMCAwCjAgMCAwIDAgMAoxIDAgMCAwIDAKMSAwIDAgMCAw

5
0 1 0 1 1
1 0 0 0 0
0 0 0 0 0
1 0 0 0 0
1 0 0 0 0