101. Valid Palindrome (Letters and Digits)
EasyTwo Pointers
Considering only letters and digits and ignoring case, print YES if the line is a palindrome, else NO.
Input format
A single line.
Output format
YES or NO
Example 1
Input
A man, a plan, a canal: Panama
Output
YES
Example 2
Input
race a car
Output
NO
Constraints
1 ≤ |s| ≤ 2 × 10⁵
Read input from standard input and print the answer to standard output. Your code is judged against 6 test cases, most of them hidden.
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