#include<iostream>
#include<cstdio>
#include<cstring>
#include<stack>
using namespace std;
int n;
long long m;
int main()
{
    freopen("lightt.in","r",stdin);
    freopen("lightt.out","w",stdout);
    stack<int> st;
    scanf("%d%lld",&n,&m);
    int i=1;
    while(i<=n){
        st.push(m%3);
        m/=3;
        i++;
    }
    int a;
    for(i=1;i<=n;i++){
        a=st.top();st.pop();
        if(a==0)putchar('R');
        if(a==1)putchar('G');
        if(a==2)putchar('B');
    }
}