#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;

typedef long long LL;
int m;
LL n;
int a[40];

int main(){
    int T;
    cin>>T;
    while(T--){
    cin>>m>>n;
    memset(a, 0, sizeof(a));
    /*LL temp = n%3;
    LL temp2 = n/3;
    //if(temp == (LL)2)temp2++;
    temp2 %= 3;
    a[m-1] = temp;
    a[m-2] = temp2;*/
    for(int i = m-1; i >= 0; i--){
        a[i] = n%3;
        int flag = 0;
        //if(n%3 == 2)flag = 1;
        n /= 3;
        //n += flag;
    }
    for(int i = 0; i < m; i++){
        if(a[i] == 0)printf("R");
        else if(a[i] == 1)printf("G");
        else if(a[i] == 2)printf("B");
    }
        //printf("%d\n", a[0]);
    printf("\n");
    }
    return 0;
}