#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define rng(i,c,n) for(int i=c;i<n;i++)
#define fi first
#define se second
#define pb push_back
#define all(a) a.begin(), a.end()
#define sz(a) ((int) a.size())
#define vec(...) vector<__VA_ARGS__>
#define _3PawRSC ios::sync_with_stdio(0),cin.tie(0)
typedef long long ll;
using vi=vector<int>;
using pii=pair<int,int>;
void print(){cout<<'\n';}
template<class h,class...t>
void print(const h&v,const t&...u){cout<<v<<' ',print(u...);}

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

signed main(){
_3PawRSC;
	int __t;
	cin>>__t;
	rep(cs,__t){
		slv();
	}
}