#include<bits/stdc++.h>
using namespace std;
#define ll long long
ll n;
string rep(ll n,string s){
	if(!n)return "";
	else if(n==1)return s;
	if(n<=9){
		string res;res+=(char)(n+48);
		if(s.length()==1)return res+s;
		else return res+"["+s+"]";
	}
	return "9["+rep(n/9,s)+"]"+rep(n%9,s);
}
string solve(ll n){
	if(n==1)return "AE";
	else if(n&1)return rep(2,solve(n/2))+rep(n/2,"AC")+"A"+rep(n/2,rep(n/2,"CE")+"C"+rep(n/2+1,"A"))+rep(n,"E");
	else return solve(n-1)+rep(n-1,"AC")+"A"+rep(n,"E");
}
int main(){
	scanf("%lld",&n);
	cout<<solve(n)<<rep(n,"C")<<endl;
	return 0;
}