Codeforces_707A

// Codeforces 707A

#include <iostream>

using namespace std;

int main()
{
    int n, m;
    char symb;
    bool rez = false;
    cin >> n >> m;
    for( int i = 0; i < n; i++ )
    {
        for( int y = 0; y < m; y++ )
        {
            cin >> symb;
            if( symb == 'C' || symb == 'M' || symb == 'Y' )
            {
                rez = true;
            }
        }
    }
    if( rez == true ){ cout << "#Color"; }
    else{cout << "#Black&White"; }
    return 0;
}