#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using ll = long long;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using mint = atcoder::modint998244353;

void solve(){
	int n;
	cin>>n;
	string ans="ABACBC";
	rep(i,n-2) ans+="ABC";
	cout<<ans<<"\n";
}

int main(){
	int t;
	cin>>t;
	rep(i,t) solve();
}