#include <bits/stdc++.h>
#include<string>
using namespace std;
string s;
int n,m,sum,K;
int main(){
cin>>n>>m;
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
    cin>>s[j];
    if (s[j]=='C'||s[j]=='M'||s[j]=='Y'){ cout<<"#Color";K++;break;}
    else sum++;
}   if(K!=0)
    break;
} if(sum==n*m) cout<<"#Black&White";

 return 0;
}