#include <iostream>

#include <cstdio>

#include <cstring>

#include <algorithm>

#include <cmath>

#include <bits/stdc++.h>

#include <stack>

#include <map>

using namespace std;

#define For(i,j,n) for(int i=j;i<=n;i++)

#define mst(ss,b) memset(ss,b,sizeof(ss));

typedef  long long LL;

template<class T> void read(T&num) {

    char CH; bool F=false;

    for(CH=getchar();CH<'0'||CH>'9';F= CH=='-',CH=getchar());

    for(num=0;CH>='0'&&CH<='9';num=num*10+CH-'0',CH=getchar());

    F && (num=-num);

}

int stk[70], tp;

template<class T> inline void print(T p) {

    if(!p) { puts("0"); return; }

    while(p) stk[++ tp] = p%10, p/=10;

    while(tp) putchar(stk[tp--] + '0');

    putchar('\n');

}

const LL mod=1e9+7;

const double PI=acos(-1.0);

const int inf=1e9+10;

const int N=1e5+10;

const int maxn=1e3+20;

const double eps=1e-12;

int main()

{

    int n,m,flag=1;

    char x,y;

    read(n);read(m);

    For(i,1,n)

    {

        For(j,1,m)

        {

            scanf("%c%c",&x,&y);

            if(x=='C'||x=='M'||x=='Y')flag=0;

        }

    }

    if(flag)cout<<"#Black&White\n";

    else cout<<"#Color\n";

    return 0;

}