Palindrome check

Problem

A form field must hold a palindrome. Ignore letter case and every character that is not a letter or digit. Print Yes or No.

Example 1

Input

A man, a plan, a canal: Panama

Output

Yes

Yes after cleaning.

Example 2

Input

race a car

Output

No

Not symmetric.

Try the problem first. Open one hint at a time.

Hint 1

Compare the first and last useful characters, then move inward.

Hint 2

Skip a character with isalnum() false, and compare with lower().

Write your Python code, run it on the examples and submit it to hidden tests.