#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
inline void read(int &x){
    x=0;char ch;bool flag = false;
    while(ch=getchar(),ch<'!');if(ch == '-') ch=getchar(),flag = true;
    while(x=10*x+ch-'0',ch=getchar(),ch>'!');if(flag) x=-x;
}
inline void read(ll &x){
    x=0;char ch;bool flag = false;
    while(ch=getchar(),ch<'!');if(ch == '-') ch=getchar(),flag = true;
    while(x=10*x+ch-'0',ch=getchar(),ch>'!');if(flag) x=-x;
}
#define rg register int
#define rep(i,a,b) for(rg i=(a);i<=(b);++i)
#define per(i,a,b) for(rg i=(a);i>=(b);--i)
const int maxn = 100010;
int a[maxn];
int main(){
    freopen("lightt.in","r",stdin);
    freopen("lightt.out","w",stdout);
    long long m;int n;
    read(n);read(m);
    for(int i=n-1;i>=0&&m>0;i--){
	int r=m%3;m/=3;
	if(r==1) a[i]=1;
	if(r==2) a[i]=2;
    }
    for(int i=0;i<n;i++){
	if(a[i]==0) putchar('R');
	if(a[i]==1) putchar('G');
	if(a[i]==2) putchar('B');
    }
    return 0;
}