#include<bits/stdc++.h>
using namespace std;
#define int long long
int n;
string s="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
signed main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n;
	if(n%26==0)cout<<"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	else{
		n=n%26;
		string s1=s.substr(0,n);
		s.erase(0,n);
		s+=s1;
	}
	cout<<s;
	return 0;
}