Competitions

# Week 2: November 16 – 22. Conditional statement. Part 2

# 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