#include <iostream>
#include <cstdio>

using namespace std;

const char col[4] = "RGB";

long long n;
int m, bit;
char s[35];

int main() {
    int T; cin >> T;
    while (T--) {
        cin >> m >> n;
        
        bit = 0;
        while (bit < m) {
            s[++bit] = col[n % 3];
            n /= 3;
        }
        
        for (int i = bit; i; --i)
            putchar(s[i]);
        puts("");
    }
    
    return 0;
}