#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <math.h>

#ifdef DEBUG
#define DBG(x) x
#else
#define DBG(x)
#endif

FILE * in;


int main ()
 {
   int corrupt;
   int m[110][110];
   int siz;
   int line,col, badl, badc;
   in = fopen ("error.in", "r");
   
   while (1)
     {
       int i,j;
       corrupt = 0;
       fscanf (in, "%d ", &siz);
       if (siz == 0) break;
       for (i=0; i<siz; ++i)
         for (j=0; j<siz; ++j)
           fscanf (in, "%d ", &(m[i][j]));
       badl=badc=-1; line=col=0;
       for (i=0; i<siz; ++i)
         {
           line=col = 0;
           for (j=0; j<siz; ++j)
             {
	       line += m[i][j];
	       col += m[j][i];
             }
           if (line % 2)
	     if (badl >= 0) {corrupt = 1; break;}
	     else badl = i;
           if (col % 2)
	     if (badc >= 0) {corrupt = 1; break;}
	     else badc = i;
         }
       if (corrupt) { printf ("Corrupt\n"); continue;}
       if (badl <0 && badc <0) {printf ("OK\n"); continue;}
       if (badl < 0 || badc <0) {printf ("Corrupt\n"); continue;}
       printf ("Change bit (%d,%d)\n", badl+1, badc+1);
     } 

   return 0;
 }