#806. Isogram?
If no letter repeats in the word, print `Yes`. If some letter repeats, print `No`.
### Input
One word.
### Output
`Yes` or `No`.
Examples
Input
robot
Output
No
Input
python
Output
Yes
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.