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Digits in numbers. Conditional statement

One-digit number

Integer n is given. Print Ok, if n is one-digit number and No otherwise.

Input

One integer n.

Output

Print Ok, if n is one-digit number and No otherwise.

Time limit 1 second
Memory limit 128 MiB
Input example #1
7
Output example #1
Ok
Input example #2
-13
Output example #2
No
Author Matviychuk Sergiy Volodymyrovych
Source "ABC programming"