#include <stdio.h>
#include <stdlib.h>

int main()
{
    int a[100][100],n,m,i,j,column=0,row=0,k=0,x,y,z=0;
    while(scanf("%d",&n) !=EOF) {
        if(n==0)
            break;

        k = 0; /*reset*/
        z = 0;

        for(i=0; i<=n-1; i++) {
            for(j=0; j<=n-1; j++) { /*@@*/
                scanf("%d",&m);
                a[i][j]=m;
            }
        }
        for(i=0; i<=n-1; i++) {
            row = 0;/*reset*/
            column = 0;
            for(j=0; j<=n-1; j++) {
                row+=a[i][j];
                column+=a[j][i];
            }
            if(row%2==1) {
                x=i;
                k++;
            }
            if(k>=2) {
                printf("Corrupt\n");/*\n!!*/
                break;
            }
            if(column%2==1) {
                y=i;/*think about this*/
                z++;
            }
            if(z>=2) {
                printf("Corrupt\n");
                break;
            }
        }
        if(k==0&&z==0)
            printf("OK\n");
        if(k==1&&z==1)
            printf("Change bit (%d,%d)\n",x + 1,y + 1);
    }

    return 0;
}