#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2,fma")
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, int> pli;
#define MAX 505050
#define INF 1e18
vector<int> lst[960];
int N = 960;
int mp[1010][1010];
int adj[MAX][9];
int cr[MAX];
int ans[MAX];
string S = "KQRBN";
int make_tree(int loc, vector<int>& lst, int dep = 0) {
	if (dep >= 6) return -1;
	if (lst.size() == 1) {
		ans[loc] = lst[0];
		return loc;
	}
	ans[loc] = -1;
	int i, c;
	for (auto c : lst) {
		vector<int> ch[9];
		for (i = 0; i < 9; i++) ch[i] = vector<int>();
		for (auto v : lst) ch[mp[c][v]].push_back(v);
		int v = loc + 1;
		int chk = 1;
		for (i = 0; i < 9; i++) if (ch[i].size()) {
			int res = make_tree(v, ch[i], dep + 1);
			if (!~res) {
				chk = 0;
				break;
			}
			adj[loc][i] = v;
			v = res + 1;
		}
		if (!chk) continue;
		cr[loc] = c;
		return v;
	}
	return -1;
}
void query(int loc) {
	if (~ans[loc]) {
		for (auto v : lst[ans[loc]]) cout << S[v];
		cout << endl;
		return;
	}
	for (auto v : lst[cr[loc]]) cout << S[v];
	cout << endl;
	int x;
	cin >> x;
	if (x == 8) return;
	query(adj[loc][x]);
}
signed main() {
	ios::sync_with_stdio(false), cin.tie(0);
	vector<int> v = { 0, 1, 2, 2, 3, 3, 4, 4 };
	int i, j, k;
	int cnt = 0;
	while (1) {
		int k, r1, r2, b1, b2;
		k = r1 = r2 = b1 = b2 = -1;
		for (i = 0; i < 8; i++) {
			if (v[i] == 0) k = i;
			if (v[i] == 2) r2 = r1, r1 = i;
			if (v[i] == 3) b2 = b1, b1 = i;
		}
		if (((b1 ^ b2) & 1) && r2 < k && k < r1) lst[cnt++] = v;
		if (!next_permutation(v.begin(), v.end())) break;
	}
	for (i = 0; i < N; i++) {
		for (j = 0; j < N; j++) {
			for (k = 0; k < 8; k++) mp[i][j] += lst[i][k] == lst[j][k];
		}
	}
	vector<int> bum;
	for (i = 0; i < N; i++) bum.push_back(i);
	int M = make_tree(1, bum);
	while (1) {
		string s;
		cin >> s;
		if (s[0] == 'G') {
			int a;
			cin >> a;
			query(1);
		}
		else break;
	}
}