#include<bits/stdc++.h>
using namespace std;
using i64=long long;
auto rep=[](i64 t,auto F){
   int i=0;
   for(;t;i++,t/=9){
      if(i)cout<<"9[";
      if(t%9)cout<<t%9<<"[",F(),cout<<"]";
   }if(i)for(;--i;cout<<"]");
};
auto rstr=[](i64 t,string s){rep(t,[s]{cout<<s;});};
void f(i64 n){
   if(n==1){cout<<"AE";return;}
   if(n==2){cout<<"AEACAEE";return;}
   if(~n&1){f(n-1);rstr(n-1,"AC"),cout<<"A",rstr(n,"E");return;}
   i64 h=n>>1;
   rep(2,[=]{f(h);}),rstr(h,"AC"),cout<<"A";
   rep(h,[=]{rstr(h-1,"CA"),cout<<"C",rstr(h,"E");});
   rstr(h,"CA"),rstr(h,"A"),rstr(n,"E");
}
int main(){
   i64 n;cin>>n;
   f(n),rstr(n,"C");
   return 0;
}