#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);

    int T;
    cin >> T;
    while(T--){
        int N;
        cin >> N;
        N -= 2;
        cout << "ABACBC";
        for (int i=0; i<N; i++){
            cout << "ABC";
        }
        cout << endl;
    }

    return 0;
}