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EI2021Q13 - DESCENDING

Given a positive integer N (0 ≤ N ≤ 1016). Write a program to check if all digits in N are in descending order?

Input

an integer N (0 ≤ N ≤ 1016)

Output

Write YES if all digits in N are in descending, otherwise write NO

Example

Input:
988765553200

Output:
YES

Input:
765587654321

Output:
NO
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