#include <stdio.h>
#include <string.h>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <algorithm>
#include <iostream>
#include <string>
#define clr(x,c) memset(x, c, sizeof(x))
#define pb push_back
#define mp make_pair
#define pii pair<int, int>
#define psi pair<string, int>
#define inf 0x3f3f3f3f
typedef __int64 lld;
using namespace std;

inline char getState(int s)
{
    if (s == 0) return 'R';
    if (s == 1) return 'G';
    if (s == 2) return 'B';
}

int main ()
{
    int t;
    cin >> t;
    while (t--) {
        int m;
        lld n;
        cin >> m >> n;
        vector<char> ans;
        while (n) {
            int s = n % 3;
            ans.pb(getState(s));
            n /= 3;
            if (ans.size() == m) break;
        }
        for (int i = ans.size(); i < m; ++i) {
            ans.pb(getState(0));
        }
        reverse(ans.begin(), ans.end());
        for (int i = 0; i < m; ++i) {
            cout << ans[i];
        }
        cout << endl;
    }
    return 0;
}