#include <bits/stdc++.h> using namespace std; int main() { int n; string s="",ans; char c = 'A'; cin >> n; while(n--) { ans=""; for(int i = 1; i<=3; i++) { if(i != 2) { ans += s; } else { ans += c; } } s = ans; c++; } cout << ans; return 0; }