Problem
Given a sentence S, print the longest word with even length. If there are multiple, print the first. If none, print "None".
Input format
Input
input.txt
- String S (up to 100 chars)
Output format
Output
output.txt
- Longest even-length word or "None"
Example
input
hello test openai go
output
openai
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Sample cases (from the problem)
Sample Case 1
Input
hello test openai go
Expected output
openai
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