#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 998244353
string guess_sequence(int n)
{
string a = "A", b = "B", x = "X", y = "Y", k, e;
ll f = press(a + b), i = 2;
if(f){
if(press(a)){
e = a;
a = y;
}
else{
e = b;
b = y;
}
k += e;
}
else{
if(press(x)){
e = x;
x = y;
k += e;
}
else{
k += y;
}
}
for (; i < n; i++){
f = press(k + a + k + b + a + k + b + b + k + b + x);
if(f - i - 1){
if(f - i){
k += x;
}
else{
k += a;
}
}
else{
k += b;
}
}
if (n - 1){
if(press(k + a) - i + 1){
k += a;
}
else{
if(press(k + b) - i + 1){
k += b;
}
else{
k += x;
}
}
}
return k;
}
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