#include<cstdio>
#include<iostream>
#include<string>
using namespace std;
using ll=long long;
string repeat(string s,int n){
	if(!n)return "";
	if(n<=9){
		if(n==1)return s;
		string res;res.push_back(n+'0');
		return res+"["+s+"]";
	}else return "9["+repeat(s,n/9)+"]"+repeat(s,n%9);
}
string solve(ll n){
	if(n==1)return "A";
	if(n==2)return "ACAEA";
	if(n&1){
		string res=repeat(solve(n>>1),2);
		res+=repeat("FD",n-1);
		res+=repeat(repeat("BD",n>>1)+"B"+repeat("F",n>>1),n>>1);
		res+=repeat("B",n>>1);
		return res+"A";
	}else{
		string res=solve(n-1);
		res+=repeat("E",n-1);
		res+=repeat("AC",n-1);
		return res+"A";
	} 
}
int main(){
	ll n;cin>>n;
	cout<<solve(n)+repeat("E",n)+repeat("C",n)<<'\n';
	return 0;
}