Valid Palindrome
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Problem statement
A label inspector ignores spaces and punctuation and treats uppercase and lowercase English letters as identical. After retaining only ASCII letters and digits, decide whether the label reads the same forwards and backwards. A label with no retained characters qualifies.
Input format
One line of printable ASCII text; spaces are part of the input.
Output format
Print true or false in lowercase.
Constraints
1 <= input length <= 100000.
Sample input
Step on no pets!
Sample output
true
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