Problem:
Score : 200 points

Problem Statement

You are given a string S consisting of lowercase English letters. Determine whether all the characters in S are different.

Constraints

2 ≤ |S| ≤ 26, where |S| denotes the length of S.

S consists of lowercase English letters.

Input

Input is given from Standard Input in the following format:

S

Output

If all the characters in S are different, print yes (case-sensitive); otherwise, print no.

Sample Input 1

uncopyrightable

Sample Output 1

yes

Sample Input 2

different

Sample Output 2

no

Sample Input 3

no

Sample Output 3

yes

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.Arrays;
import java.util.Scanner;

public class Main {

	public static boolean hasDuplcate(char[] arr) {
		int[] counts = new int['z'-'a'+1];
		Arrays.fill(counts, 0);
		for(char c: arr) {
			counts[c-'a']++;
			if(counts[c-'a']>1)
				return true;
		}
		return false;
	}

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String str = sc.next();
		sc.close();

		System.out.println(hasDuplcate(str.toCharArray()) ? "no" : "true");
	}
}