Problem
Given a string, remove all characters that are not alphabetic letters (a-z, A-Z).
Input format
Input
input.txt
- A single string (up to 100 characters, may contain digits/symbols)
Output format
Output
output.txt
- The cleaned string containing only letters
Example
input
a1!b2@c3#
output
abc
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Sample cases (from the problem)
Sample Case 1
Input
a1!b2@c3#
Expected output
abc
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