#include<iostream> using namespace std; int main(){ int n; cin>>n; if(n>=0&&n<10){ if(n==0){ cout<<"a"; }else if(n==1){ cout<<"b"; }else if(n==2){ cout<<"c"; }else if(n==3){ cout<<"d"; }else if(n==4){ cout<<"e"; }else if(n==5){ cout<<"A"; }else if(n==6){ cout<<"B"; }else if(n==7){ cout<<"C"; }else if(n==8){ cout<<"D"; }else if(n==9){ cout<<"E"; } } return 0; }