Problems
Five-digit in order
Five-digit in order
Five-digit number is given. Determine whether all its digits are in ascending order, starting with the leftmost one. For example, in the number 15689 all digits are arranged in ascending order.
Input
One five-digit number.
Output
Print "YES", if all digits in number are arranged in ascending order, and "NO" otherwise.
Input example #1
15689
Output example #1
YES