#include<bits/stdc++.h>
using namespace std;
int main()
{
int n,a[110][110];
while(scanf("%d",&n) && n)
{
int b=0,t=0;
for(int i=0; i<n; i++)
{
for(int j=0; j<n; j++)scanf("%d",&a[i][j]);
}
int i,I=0,J=0;
for(i=0; i<n; i++)
{
int r=0,c=0;
for(int l=0; l<n; l++)r+=a[i][l];
if(r&1 && !b)
{
bool balance=false;
for(int j=0; j<n; j++)
{
if(a[i][j] || !a[i][j])
{
c=0;
for(int k=0; k<n; k++)c+=a[k][j];
if(c&1 && !b)
{
balance=true;
a[i][j]=0;
I=i+1;
J=j+1;
b=1;
break;
}
}
}
if(!balance)
{
t=1;
break;
}
}
else if(r&1 && b)
{
t=1;
break;
}
c=0;
for(int k=0; k<n; k++)c+=a[k][i];
if(c&1 && !b)
{
bool balance=false;
for(int k=0; k<n; k++)
{
if(a[k][i]==1 || a[k][i]==0)
{
r=0;
for(int j=0; j<n; j++)r+=a[k][j];
if(r&1 && !b)
{
a[k][i]=0;
balance=true;
I=k+1;
J=i+1;
b=1;
break;
}
}
}
if(!balance)
{
t=1;
break;
}
}
}
if(t)printf("Corrupt\n");
if(!t)
{
if(!I && !J)printf("OK\n");
else printf("Change bit (%d,%d)\n",I,J);
}
}
return 0;
}
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