#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

void solve() {
    int n; cin>>n;
    cout<<"ABACBC";
    n-=2;
    while (n--) cout<<"ABC";
    cout<<"\n";
}

int main() {
    int t=1; cin>>t;
    while (t--) solve();
}