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.
\InputFile
One five-digit number $n$.
\OutputFile
Print ""\textbf{YES}", if all digits in number $n$ are arranged in ascending order, and ""\textbf{NO}" otherwise.
Input example #1
15689
Output example #1
YES
Input example #2
12321
Output example #2
NO