#include<bits/stdc++.h>
using namespace std;
namespace my_std{
	#define ll long long
	#define bl bool
	ll my_pow(ll a,ll b,ll mod){
		ll res=1;
		if(!b) return 1;
		while(b){
			if(b&1) res=(res*a)%mod;
			a=(a*a)%mod;
			b>>=1;
		}
		return res;
	}
	ll qpow(ll a,ll b){
		ll res=1;
		if(!b) return 1;
		while(b){
			if(b&1) res*=a;
			a*=a;
			b>>=1;
		}
		return res;
	}
	#define db double
	#define pf printf
	#define pc putchar
	#define fr(i,x,y) for(register ll i=(x);i<=(y);i++)
	#define pfr(i,x,y) for(register ll i=(x);i>=(y);i--)
	#define go(u) for(ll i=head[u];i;i=e[i].nxt)
	#define enter pc('\n')
	#define space pc(' ')
	#define fir first
	#define sec second
	#define MP make_pair
	#define il inline
	#define inf 8e18
	#define random(x) rand()*rand()%(x)
	#define inv(a,mod) my_pow((a),(mod-2),(mod))
	il ll read(){
		ll sum=0,f=1;
		char ch=0;
		while(!isdigit(ch)){
			if(ch=='-') f=-1;
			ch=getchar();
		}
		while(isdigit(ch)){
			sum=sum*10+(ch^48);
			ch=getchar();
		}
		return sum*f;
	}
	il void write(ll x){
		if(x<0){
			x=-x;
			pc('-');
		}
		if(x>9) write(x/10);
		pc(x%10+'0');
	}
	il void writeln(ll x){
		write(x);
		enter;
	}
	il void writesp(ll x){
		write(x);
		space;
	}
}
using namespace my_std;
ll pw[20];
string tmp;
string work(ll k,string s){
	string ans="";
	pfr(i,19,0){
		ll now=k/pw[i];
		if(now){
			ans+=(char)('0'+now);
			ans+='[';
			fr(j,1,i){
				ans+='9';
				ans+='[';
			}
			ans+=s;
			fr(j,1,i) ans+=']';
			ans+=']';
			k%=pw[i];
		}
	}
	return ans;
}
void solve(ll n){
	if(n==1){
		pf("AC");
		return;
	}
	if(n%2==1){
		ll k=n/2;
		write(2);
		pc('[');
		solve(k);
		pc(']');
		cout<<work(k,"AE");
		pc('A');
		tmp=work(k,"EC");
		tmp+='E';
		tmp+=work(k+1,"A");
		cout<<work(k,tmp);
		cout<<work(n,"C");
	}
	else{
		solve(n-1);
		cout<<work(n-1,"AE");
		pc('A');
		cout<<work(n,"C");
	}
}
int main(){
	pw[0]=1;
	fr(i,1,19) pw[i]=pw[i-1]*9;
	ll n=read();
	solve(n);
	cout<<work(n,"E");
}