#402. How many times does the digit 0 appear?
You get a positive integer n. Use `while` to count how many times the digit 0 appears in it.
### Input
One integer n (1 ≤ n ≤ 10¹⁸).
### Output
One integer.
Examples
Input
160930935651281617
Output
2
Input
404487969019847200
Output
4
💡 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.