Problem
Given a string S, print the first non-alphabetic character. If all are alphabetic, print "None".
Input format
Input
input.txt
- String S (1–100, may contain symbols, digits, spaces)
Output format
Output
output.txt
- The first non-alphabetic character or "None"
Example
input
hello_world!
output
_
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Sample cases (from the problem)
Sample Case 1
Input
hello_world!
Expected output
_
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