Problem:
Score : 300 points

Problem Statement

1000000000000001 dogs suddenly appeared under the roof of Roger's house, all of which he decided to keep. The dogs had been numbered 1 through 1000000000000001, but he gave them new names, as follows:

the dogs numbered 1,2,\cdots,26 were respectively given the names a, b, ..., z;

the dogs numbered 27,28,29,\cdots,701,702 were respectively given the names aa, ab, ac, ..., zy, zz;

the dogs numbered 703,704,705,\cdots,18277,18278 were respectively given the names aaa, aab, aac, ..., zzy, zzz;

the dogs numbered 18279,18280,18281,\cdots,475253,475254 were respectively given the names aaaa, aaab, aaac, ..., zzzy, zzzz;

the dogs numbered 475255,475256,\cdots were respectively given the names aaaaa, aaaab, ...;

and so on.

To sum it up, the dogs numbered 1, 2, \cdots were respectively given the following names:

a, b, ..., z, aa, ab, ..., az, ba, bb, ..., bz, ..., za, zb, ..., zz, aaa, aab, ..., aaz, aba, abb, ..., abz, ..., zzz, aaaa, ...

Now, Roger asks you:

"What is the name for the dog numbered N?"

Constraints

N is an integer.

1 \leq N \leq 1000000000000001

Input

Input is given from Standard Input in the following format:

N

Output

Print the answer to Roger's question as a string consisting of lowercase English letters.

Sample Input 1

2

Sample Output 1

b

Sample Input 2

27

Sample Output 2

aa

Sample Input 3

123456789

Sample Output 3

jjddja

Solution in Java (OpenJDK 11.0.6) (judge verdict: Runtime Error)

import java.util.Scanner;

public class Main {

	private static long n;
	private static String[] numeralSystem;

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		n = scanner.nextInt();
		fillNumeralSystem();
//		translateNumber();
		System.out.println(translateNumber());
	}

	private static void fillNumeralSystem() {
		numeralSystem = new String[27];
		numeralSystem[0] = "z";
		int delta = (int) 'a';
		for (int i = 1; i < numeralSystem.length; i++) {
			numeralSystem[i] = Character.toString(i - 1 + delta);
		}
	}

	public static String translateNumber() {

		String res = "";

		while (n > 26) {
			res = numeralSystem[(int) (n % 26)].concat(res);
			n--;
			n /= 26;
		}

		res = numeralSystem[(int) n].concat(res);

		return res;
	}
}