#include<bits/stdc++.h>
using namespace std;
namespace IO_ER{
	#define LL long long
	#define db double
	#define In inline
	#define ULL unsigned long long
	#define f(a,b,i) for(int i=a;i<=b;i++)
	#define ff(a,b,i) for(int i=a;i<b;i++)
	#define f_(a,b,i) for(int i=a;i>=b;i--)
	#define ff_(a,b,i) for(int i=a;i>b;i--)
	typedef pair<int,int> Pi;
	const int inf=0x3f3f3f3f;
	const int INF=0x7fffffff;
	const LL infll=0x3f3f3f3f3f3f3f3fll;
	const LL INFll=0x7fffffffffffffffll;
	int f=0;
	char ChAR;
	template<typename T>void read(T &x){
		x=0;
		f=0;
		ChAR=getchar();
		while(ChAR<'0'||ChAR>'9'){
			if(ChAR=='-')f=1;
			ChAR=getchar();
		}
		while('0'<=ChAR&&ChAR<='9'){
			x=(x<<1)+(x<<3)+(ChAR^48);
			ChAR=getchar();
		}
		x=f?-x:x;
	}
	template<typename T,typename ...Args>void read(T &x,Args &...args){
		read(x);
		read(args...);
	}
}
using namespace IO_ER;

#define N 301050
#define mod 1000000007

LL n; 
/*
翻转 
A    B    C    D    E    F
右   右下 左下 左   左上 右上 
*/

string repeat(string s,LL len){
	if(s.empty()||!len)return "";
	if(len==1)return s;
	string res;
	res.push_back(len+'0');
	if(len<=9)return res+"["+s+"]";
	return "9["+repeat(s,len/9)+"]"+repeat(s,len%9); 
}

string dfs(LL len){
	if(len==1)return "A";
	if(len==2)return "AEACA";
	LL mid=len>>1;
	string res;
	if(len&1){
		res=repeat(dfs(mid),2);
		res+=repeat("FD",len-1);
		res+=repeat(repeat("BD",mid)+"B"+repeat("F",mid),mid);
		res+=repeat("B",mid);
		res+="A";
		return  res;	
	}
	else{
		res=dfs(len-1);
		res+=repeat("E",len-1);
		res+=repeat("AC",len-1);
		res+="A";
		return res;
	} 
}

int main(){
//	freopen("counting.in","r",stdin);
//	freopen("counting.out","w",stdout);
//	freopen("1.txt","w",stdout);
	read(n);
	cout<<dfs(n)+repeat("E",n)+repeat("C",n);
	return 0;
}