#include <cstdio>
#include <cstring>
#define MAX_N 1005
using namespace std;
int main() {
    __int64 t, m, n;
    int str[MAX_N];
    scanf("%I64d", &t);
    while (t--) {
        memset(str, 0, sizeof(str));
        scanf("%I64d %I64d", &m, &n);
        __int64 cnt = 0;
        while (n) {
            str[cnt++] = n % 3;
            n /= 3;
        }
        if (cnt < m) {
            for (__int64 i = 0; i < m - cnt; i++)   printf("R");
            for (__int64 i = cnt - 1; i >= 0; i--) {
                if (str[i] == 0)    printf("R");
                else if (str[i] == 1) printf("G");
                else if (str[i] == 2) printf("B");
            }
        }
        else{
            for (__int64 i = m - 1; i >= 0; i--) {
                if (str[i] == 0)    printf("R");
                else if (str[i] == 1) printf("G");
                else if (str[i] == 2) printf("B");
            }
        }
        printf("\n");
    }
    return 0;
}