#include "combo.h"
#include <bits/stdc++.h>
#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
#define all(a) a.begin() , a.end()
#define F first
#define S second
using namespace std;
using ll = long long;
const ll N = 1e6+5 , inf = 2e9 + 7 , block = 1000;
const ll INF = 1e18 , mod = 1e9+7;
string guess_sequence(int N) {
string s = "";
string s1 = "";
if(press("A")) s = "A" , s1 = "BXY";
else if(press("Y")) s = "Y" , s1 = "ABX";
else if(press("X")) s = "X" , s1 = "ABY";
else s = "B" , s1 = "ABX";
for(int i = 2; i <= N; i++){
for(int j = 0; j < 3; j++){
if(j == 2){
s += s[j];
} else {
s += s[j];
if(press(s) == i) break;
s.pop_back();
}
}
}
return s;
}
