Mobile coding works. A laptop is faster for long sessions.
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
💬 Discussion
Loading...💬
No comments yet. Be the first to start the discussion!
💻 No output yet.
Click Run in the editor to execute your code with the custom input.
Sample cases (from the problem)
Sample Case 1
Input
machine
Expected output
YES
Solve it your way first
Community solutions unlock after you submit a passing solution. Don't peek.
Ready to solve this challenge?
Create a free account to write code, submit solutions, and track your progress.
⌨️ Keyboard Shortcuts
Code Editor
Run Code
Ctrl
Enter
Submit Code
Ctrl
Shift
Enter
Format Code
Shift
Alt
F
Toggle Comment
Ctrl
/
Undo
Ctrl
Z
Redo
Ctrl
Y
Navigation
Global Search
/
Show Shortcuts
?
Close Modal
Esc