//# pragma GCC optimize("Ofast,no-stack-protector")
//# pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
# pragma GCC optimize("Ofast")
# pragma GCC optimization ("unroll-loops")
# include "bits/stdc++.h"
std::pair<int,int> DR[] = {{-1,0},{0,1},{1,0},{0,-1},{-1,1},{-1,-1},{1,1},{1,-1}};
# define ll long long
# define clock (clock() * 1000.0 / CLOCKS_PER_SEC)
# define rc(s) return cout << s,0
# define rcg(s) cout << s;exit(0)
# define _ ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
# define db(x) cerr << #x << " = " << x << '\n'
# define pb push_back
# define mp make_pair
# define all(s) s.begin(),s.end()
# define sz(x) (int)((x).size())
//# define int ll
using namespace std;
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# define LOCAL
# define sim template < class c
# define ris return * this
# define dor > debug & operator <<
# define eni(x) sim > typename \
enable_if<sizeof dud<c>(0) x 1, debug&>::type operator<<(c i) {
sim > struct rge { c b, e; };
sim > rge<c> range(c i, c j) { return rge<c>{i, j}; }
sim > auto dud(c* x) -> decltype(cerr << *x, 0);
sim > char dud(...);
struct debug {
#ifdef LOCAL
~debug() { cerr << endl; }
eni(!=) cerr << boolalpha << i; ris; }
eni(==) ris << range(begin(i), end(i)); }
sim, class b dor(pair < b, c > d) {
ris << "(" << d.first << ", " << d.second << ")";
}
sim dor(rge<c> d) {
*this << "[";
for (auto it = d.b; it != d.e; ++it)
*this << ", " + 2 * (it == d.b) << *it;
ris << "]";
}
#else
sim dor(const c&) { ris; }
#endif
};
#define show(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "
int gcd(int a, int b)
{
if(b) return gcd(b,a%b);
return a;
}mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# include "combo.h"
string guess_sequence(int n){
char init;
if(press("AB"))
{
if(press("A")) init = 'A';
else init = 'B';
}
else
{
if(press("X")) init = 'X';
else init = 'Y';
}
string let = "";
if(init != 'A') let += 'A';
if(init != 'B') let += 'B';
if(init != 'X') let += 'X';
if(init != 'Y') let += 'Y';
string s = "";s+=init;
if(n == 1) return s;
for(int i = 2;i <= n - 1;i++)
{
string topress = "";
for(int j = 0;j < 3;j++)
{
topress += s;
topress += let[0];
topress += let[j];
}
topress += s;
topress += let[1];
int x = press(topress) - sz(s);
if(x == 2) s += let[0];
else if(x == 1) s += let[1];
else s += let[2];
}
string topress = s;
topress += let[0];
topress += s;
topress += let[1];
if(press(topress) - sz(s))
{
topress = s;
topress += let[0];
if(press(topress) - sz(s)) s+=let[0];
else s+=let[1];
}
else s += let[2];
return s;
}
/*
int32_t main(){_
// freopen("input","r",stdin);
return 0;
}*/
