#include<bits/stdc++.h>
using namespace std;
int query(string q);
string guess(int n, int s){
if(n <= s || (n <= 100 && s <= 4)){
string ans = "";
for(int i = 0, bef = 0; i < n; i++){
for(int j = 0; j <= i; j++){
for(int k = 0; k < s; k++){
string candidate = "";
for(int t = 0; t < j; t++){
candidate += ans[t];
}
candidate += char(97 + k);
for(int t = j; t < i; t++){
candidate += ans[t];
}
if(query(candidate) > bef){
bef++;
ans = candidate;
j = i;
break;
}
}
}
}
if(ans.size() < n){
return string(n, 'a');
}
return ans;
}
return string(n, 'a');
}
