#include "combo.h"
#include "bits/stdc++.h"
using namespace std;
string guess_sequence(int N) {
string s = "";
vector<char> posible;
int ans = press("AB");
if(ans == 0){
ans = press("X");
if(ans == 0){
s = "Y";
posible = {'A', 'B', 'X'};
}else{
s = 'X';
posible = {'A', 'B', 'Y'};
}
}else{
ans = press("A");
if(ans == 0) {s = "B";posible = {'A', 'X', 'Y'};}
else{s = 'A';posible = {'X', 'B', 'Y'};}
}
char first = s[0];
int ln = 1;
if (N == 1){
return s;
}
while (ln != N-1){
string query= s+posible[0];
for(int i=0; i < 3; i++){
query += s+posible[1]+posible[i];
}
ans = press(query);
if(ans == ln+1){
s+= posible[0];
}else if(ans == ln+2){
s+= posible[1];
}else{
s+= posible[2];
}
ln+=1;
}
ans = press(s+posible[0]+s+posible[1]);
if(ans == ln){
return s+posible[2];
}else{
ans = press(s+posible[0]);
if(ans == ln) return s+posible[1];
else{return s+posible[0];}
}
}
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