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Problem
Given an array, print the first element that appears more than once (by order of first repeat). If there is no such element, print -1.
Input format
Input
input.txt
- An integer N (1 ≤ N ≤ 100) - N integers
Output format
Output
output.txt
- The first repeated element, or -1 if none.
Example
input
6 2 3 4 5 3 2
output
3
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Sample cases (from the problem)
Sample Case 1
Input
6 2 3 4 5 3 2
Expected output
3
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