Read from standard input a string s of at most 255 characters, which may contain uppercase letters, lowercase letters, spaces, and punctuation. Determine whether the string is a palindrome, ignoring spaces, punctuation, and the difference between uppercase and lowercase letters.
Print DA if the string formed by letters only (all converted to lowercase) is a palindrome, or NU otherwise.
The program reads from standard input a single line containing the string `s`. - the string has at most `255` characters - spaces, punctuation, and case differences are ignored - a string with a single character or an empty string is considered a palindrome
The program prints to standard output `DA` or `NU`, followed by a newline.
Ele fac cafele
DA
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Ele fac cafele
DA
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