Problem
A string is an isogram if no letter appears more than once. Check if the input string is an isogram.
Input format
Input
input.txt
- A string of lowercase letters (up to 100 characters)
Output format
Output
output.txt
- "YES" if it is an isogram, otherwise "NO"
Example
input
machine
output
YES
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Sample cases (from the problem)
Sample Case 1
Input
machine
Expected output
YES
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