#include <bits/stdc++.h>   using namespace std;   long long q, n;   string h;   int main() {     ios::sync_with_stdio(NULL);     cin.tie(0);     cout.tie(0);     cin >> q;     while (q--) {       cin >> n;       if (n == 1) {         cout <<  a n ;         continue;       }       for (long long i = 1; i <= n / 2; i++) cout <<  a ;       cout << ((n % 2 == 0) ?  b  :  bc );       for (long long i = 1; i <= n / 2 - 1; i++) cout <<  a ;       cout <<   n ;     }   }   