#include <bits/stdc++.h>
using namespace std;
int main () {
int t; cin >> t;
while (t--) {
int n; cin >> n;
char temp;
if (n<=28) {
temp = 'a'+(n-2-1);
cout<< "aa" << temp << endl;
}
else if (n<=53) {
temp = 'a'+(n-27-1);
cout << "a" << temp << "z" << endl;
}
else if (n>53) {
temp='a'+(n-52-1);
cout << temp << "zz" << endl;
}
}
}
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