Unique Characters Checker

Given a string s, determine whether all the characters in the string are unique. In other words, check if there is any repeated character in the string. If every character appears exactly once, output "Yes"; otherwise, output "No". Note that an empty string is considered to contain all unique characters.

inputFormat

The input consists of a single line containing the string s. The string may include letters, numbers, or symbols. Read the input from standard input (stdin).

outputFormat

Output a single line containing "Yes" if all characters in the string are unique, otherwise output "No". Write your output to standard output (stdout).

abcdef

Yes