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Problem
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.
Input format
Input
input.txt
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
Output format
Output
output.txt
The program prints to standard output `DA` or `NU`, followed by a newline.
Example
input
Ele fac cafele
output
DA
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Sample cases (from the problem)
Sample Case 1
Input
Ele fac cafele
Expected output
DA
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