#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define ff first
#define ss second
#define pb push_back
#define vi vector<int>
#define fr(i,ii,iii) for(int i=ii;i<iii;i++)
#include "combo.h"
string guess_sequence(int N){
string ans="";
int x;
x=press("AB");
if(x==2)ans="A";
else if(x==1){
x=press("A");
if(x==1){
ans="A";
}
else ans="B";
}
else{
x=press("X");
if(x==1){
ans="X";
}
else ans="Y";
}
string a;
vector<char>v={'A','B','C','D'};
fr(i,0,4){
if(v[i]==ans[0]){
v.erase(v.begin()+i);
break;
}
}
fr(i,2,N){
a=ans;
a+=v[0];
a+=ans;
a+=v[1];a+=v[0];
a+=v[1];a+=v[1];
a+=v[1];a+=v[2];
x=press(a);
if(x==ans.size()){
ans+=v[2];
continue;
}
if(x==ans.size()+1){
ans+=v[0];
continue;
}
if(x==ans.size()+2){
ans+=v[1];
continue;
}
}
a=ans;
a+=v[0];
x=press(a);
if(x==ans.size()+1){
return a;
}
else{
a=ans;
a+=v[1];
x=press(a);
if(x==ans.size()+1){
return a;
}
else{
ans+=v[2];
return ans;
}
}
}
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