#include <bits/stdc++.h>

void solve() {
    const std::string s = "ABACBC";
    const std::string t = "ABC";
    int n;
    std::cin >> n;
    std::string ans;
    ans += s;
    for (int i = 0; i + 2 < n; i++) ans += t;
    std::cout << ans << '\n';
}

int main() {
    std::cin.tie(0)->sync_with_stdio(0);
    std::cout << std::fixed << std::setprecision(16);
    int t = 1;
    std::cin >> t;
    while (t--) solve();
}