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#!/usr/bin/env python3
import sys
def main(array):
# Count the frequency of even numbers
evens = {}
for i in array:
if i % 2 == 0:
evens[i] = evens.get(i, 0) + 1
if not evens:
# If no evens, return -1
print(-1)
else:
# Find the evens that occur most often
m = max(evens.values())
max_evens = [i for i, v in evens.items() if v == m]
# The the minimum even that occurs most often
min_max_evens = min(max_evens)
print(min_max_evens)
if __name__ == '__main__':
# Turn the strings into integers
n = [int(i) for i in sys.argv[1:]]
main(n)
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