#include <bits/stdc++.h>
#define int long long
#define pc putchar
using namespace std;

string ksm(string s, int b) {
	string res;
	while(b > 0) {
		int x = b % 9;
		if(x) {
			if(x > 1) res += (x + '0'), res += '[', res += s, res += ']';
			else res += s;
		}
		s = "9[" + s + "]", b /= 9;
	}
	return res;
}
void solve(int n) {
	if(n == 1) return cout << "AE", void();
	if(n == 2) return cout << "AEACAEE", void();
	if(n & 1) {
		cout << "2[", solve((n - 1) / 2), cout << ']';
		cout << ksm("AC", (n - 1) / 2), cout << 'A';
		cout << ksm(ksm("CE", (n - 1) / 2) + "C" + ksm("A", (n - 1) / 2 + 1), (n - 1) / 2) + ksm("E", n);
	} else solve(n - 1), cout << ksm("AC", n - 1) + "A" + ksm("E", n);
}

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0), cout.tie(0);
	
	int n;
	cin >> n;
	solve(n);
	cout << ksm("C", n);
	return 0;
}