#include<cstdio>
#include<iostream>
#include<cstring>
#include<algorithm>
using namespace std;
long long a[35];
int b[35];
int main(){
    long long cases,i,j,n,x,y,m;
    cin>>cases;

    while(cases--){
        cin>>m>>n;
        for(i=1;i<=m;i++){
            x=n%3;
            n/=3;
            b[m-i+1]=x;
        }
        for(i=1;i<=m;i++){
            if(b[i]==0)printf("R");
            else if(b[i]==1)printf("G");
            else if(b[i]==2)printf("B");
        }
        cout<<endl;
    }
    return 0;
}