#include <iostream>
using namespace std;
int main() {
// your code goes here
int m,n,d=0;
cin>>m>>n;
char c;
for(int i=0;i<m;i++)
{
for(int j=0;j<n;j++)
{
cin>>c;
if((c=='W')||(c=='B')||(c=='G'))
d++;
}
}
if(d==(m*n))
cout<<"#Black&White";
else
cout<<"#Color";
return 0;
}
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