100631: [AtCoder]ABC063 B - Varied

Memory Limit:256 MB Time Limit:2 S
Judge Style:Text Compare Creator:
Submit:0 Solved:0

Description

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

Input

题意翻译

给定一个字符串S,判断其中字符,如果全部不相同,输出yes,否则输出no

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