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

int main()
{
    int T;
    scanf("%d", &T);
    while(T--) {
        long long n, mm;
        int m[32];
        memset(m, 0, sizeof(m));
        scanf("%I64d%I64d", &mm, &n);
        int i = 0;
        for(; i < mm && n != 0; ++i) {
            m[i] = n % 3;
            n /= 3;
        }
        for(int j = mm - 1; j >= 0; j--) {
            if(m[j] == 2) {
                printf("B");
            } else if(m[j] == 1) {
                printf("G");
            } else if(m[j] == 0) {
                printf("R");
            }
        }
        printf("\n");
    }
    return 0;
}