Problem
Given a string, print the first character that does not repeat. If all characters repeat, print "-1".
Input format
Input
input.txt
- A single line with the string (up to 100 lowercase letters)
Output format
Output
output.txt
- The first non-repeating character or -1 if none
Example
input
aabbcde
output
c
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Sample cases (from the problem)
Sample Case 1
Input
aabbcde
Expected output
c
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