#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
#define MOD 1000000007
#define ll long long int
#define vi vector<int>
#define vii vector< vector<int> >
#define PI 3.1415926535897932384626433832795
#define INF 9223372036854775807LL
#define hashA 1257958787
#define hashB 1539500609
#define endl "\n"
string guess_sequence(int n) {
string st;
vector<string> chs;
if(press("AB")) {
if(press("A")) {
st = "A";
chs = {"B","X","Y"};
} else {
st = "B";
chs = {"A","X","Y"};
}
} else {
if(press("X")) {
st = "X";
chs = {"A","B","Y"};
} else {
st = "Y";
chs = {"A","B","X"};
}
}
string currs = st;
for(int i = 2; i < n; i++) {
string ask = currs;
ask+= chs[0];
ask+= currs;
ask+= chs[1];
ask+= chs[0];
ask+= currs;
ask+= chs[1];
ask+= chs[1];
ask+= currs;
ask+= chs[1];
ask+= chs[2];
int x = press(ask);
if(x == i-1) {
currs+= chs[2];
} else if(x == i) {
currs+= chs[0];
} else {
currs+= chs[1];
}
}
string ask = currs;
ask+= chs[0];
if(press(ask) == n) {
currs+= chs[0];
} else {
string askk = currs;
askk+= chs[1];
if(press(askk) == n) {
currs+= chs[1];
} else {
currs+= chs[2];
}
}
return currs;
}
