#477. While: largest digit
You get a positive integer n. Use a `while` loop to find its **largest digit**.
### Input
One integer n (1 ≤ n ≤ 10⁹).
### Output
The answer.
Examples
Input
3
Output
3
Input
12321
Output
3
💡 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.