#include <bits/stdc++.h>
	using namespace std;
	typedef long long ll ;
	typedef unsigned long long ull ;
	#define pb push_back
	#define all(v) (v).begin(), (v).end()
	#define mp make_pair
	#define rep(i,a,b) for (int i = a; i < b; i++)
	#define FastIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	void time ()
	{
		 cout<<endl<<"Clock ticks: "<<clock()<<" Seconds: "<<(double)clock()/CLOCKS_PER_SEC*1000;
	}
	//-std=c++0x

int main() {

	int n ;
	while (cin >> n && n)
	{
		int arr[n][n] ;
		int rows[n] ;
		int colos [n] ;
		int cnt = 0 ;
		vector <int> vi , vj ;

		memset(rows,0,sizeof rows);
		memset(colos,0,sizeof colos);

		rep(i,0,n)
		{
			rep(j,0,n)
				{
					cin >> arr[i][j];
					rows[i]+=arr[i][j];
					colos[j]+= arr[i][j];
				}
			if ( rows[i] %2 == 1) { cnt ++ ; vj.pb(i) ; }
		}

		rep(i,0,n)
		{
			if (colos[i]%2 ==1) { cnt++ ; vi.pb(i) ; }
		}
		if (cnt == 0) cout <<"OK"<<endl;
		else if ( cnt == 2 &&vi.size() && vj.size())
		{
			cout <<"Change bit "<<'('<<vj[0]+1<<','<<vi[0]+1<<')'<<endl;
		} else cout <<"Corrupt"<<endl;
	}
	return 0;
}