#include <cstdio>
#include <cstring>
using namespace std;
int s[100]={0};
int main() {
    int tt;
    scanf("%d", &tt);
    while (tt--) {
        int si=0,m;
        memset(s,0,sizeof(int)*100);
        unsigned long long n;
        scanf("%d%I64u",&m, &n);
        while (n) {
            s[si++]=n%3;
            n/=3;
        }
        for(int i=m-1;i>=0;i--){
            //printf("%d",s[i]);
            if(s[i]==0)printf("R");
            if(s[i]==1)printf("G");
            if(s[i]==2)printf("B");
        }
        printf("\n");
    }
    return 0;
}