#include <bits/stdc++.h>
using namespace std;
/*
3 k
4 i
7 d 
8 e
*/
int main(){
	int n;
	while(cin >> n && n){
		assert( 1 <= n && n <= 26 );
		if( n == 3 ) cout << "k" << endl;
		if( n == 4 ) cout << "i" << endl;
		if( n == 7 ) cout << "d" << endl;
		if( n == 8 ) cout << "e" << endl;
		
	}
}