#536. Remove repeated characters
You are given a word. Keep only the first appearance of each character and print the result (example: banana → ban).
### Input
One word.
### Output
One line.
Examples
Input
python
Output
python
Input
kayak
Output
kay
💡 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.