#include<cstdio>
#include<cstring>
#include<string>
#include<algorithm>
#include<string>
#include<iostream>
#include<vector>
using namespace std;
typedef long long ll;
const int maxn = 1;
const int INF = 0x3f3f3f3f;
char s[5] = "RGB";
int main()
{
    vector<int> p;
    int t;
    scanf("%d",&t);
    while(t--)
    {
        p.clear();
        ll m,n;
        cin >> m >> n;
        for(int i = 0;i < m;i++)
        {
            p.push_back(n%3);
            n/=3;
        }
        for(int i = p.size()-1;i >= 0;i--)
        {
            printf("%c",s[p[i]]);
        }
        printf("\n");
    }
    return 0;
}