#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define db double
#define ldb long double
#define pb push_back
#define fi first
#define se second
#define pii pair<int,int>
#define lowbit(i) i&(-i)
ll n,pw9[30]; 
string get_str(ll k,string x){
	if(k<=9){
		char t = '0'+k;
		if(k==1) return x;
		string res = t+x;
		return res;
	} 
	ll lg=0,n=k,m;string ex="";
	if(!k) return ex;  
	while(n>=9) n /= 9,lg++;
	if(lg){	
		for(int i=1;i<=lg;i++) ex = ex+"9[";
		m = k/pw9[lg];
		char t = '0'+m;
		if(m==1) ex = ex+x; 
		else ex = ex+t,ex = ex+x;
		for(int i=1;i<=lg;i++) ex = ex+"]";
	}
	k -= m*pw9[lg];
	ex = ex+get_str(k,x);
	return ex;
}
string solve(ll n){
	if(n==1){
		return "AE";
	}
	if(n%2==0){
		string res = solve(n-1),ex;
		//(n-1)[AC]C(n)E
		ex = get_str(n-1,"[AC]")+"A"+get_str(n,"E"); 
		res = res+ex;
		return res; 
	}
	string res = solve(n/2),ex;
	res = "2["+res+"]";
	ex = get_str(n/2,"[AC]")+"A";
	ex = ex+get_str(n/2,"["+get_str(n/2,"[CE]")+"C"+get_str((n+1)/2,"A")+"]");
	ex = ex+get_str(n,"E");
	res = res+ex;
	return res;
}
int main(){
	freopen("ans.out","w",stdout);
	ios::sync_with_stdio(0);
	cin.tie(0),cout.tie(0);
	cin >> n;
	pw9[0] = 1;
	for(int i=1;i<=25;i++) pw9[i] = pw9[i-1]*9ll;
	string ans = solve(n);
	ans = ans+get_str(n,"C");
	cout << ans;
	return 0;
}