#include <vector>
using namespace std;

int main()
{
    int n;
    while(cin >> n && n != 0)
    {
        vector<vector<int>> mat(n, vector<int>(n));
        for(int i = 0; i < n; ++i)
        {
            for(int j = 0; j < n; ++j)
            {
                cin >> mat[i][j];
            }
        }

        vector<int> row_sum(n,0);
        vector<int> col_sum(n,0);

        // 计算每行、每列和
        for(int i = 0; i < n; ++i)
        {
            for(int j = 0; j < n; ++j)
            {
                row_sum[i] += mat[i][j];
                col_sum[j] += mat[i][j];
            }
        }

        int bad_row = -1, bad_col = -1;
        int cnt_bad_r = 0, cnt_bad_c = 0;
        for(int i = 0; i < n; ++i)
        {
            if(row_sum[i] % 2 != 0)
            {
                cnt_bad_r++;
                bad_row = i;
            }
        }
        for(int j = 0; j < n; ++j)
        {
            if(col_sum[j] % 2 != 0)
            {
                cnt_bad_c++;
                bad_col = j;
            }
        }

        if(cnt_bad_r == 0 && cnt_bad_c == 0)
        {
            cout << "OK" << endl;
        }
        else if(cnt_bad_r == 1 && cnt_bad_c == 1)
        {
            // 题目行号列号从1开始
            cout << "Change bit (" << bad_row+1 << "," << bad_col+1 << ")" << endl;
        }
        else
        {
            cout << "Corrupt" << endl;
        }
    }
    return 0;
}