#! /usr/bin/env python3
 
from functools import reduce
import sys
 
def programming048(*args):
    return reduce(lambda s_1, s_2:
                  s_1 + s_2[reduce(lambda init, cnt:
                                   cnt if s_1[-cnt:] == s_2[:cnt] else init,
                                   range(1, 1 + min([len(i) for i in [s_1, s_2]])),
                                   0):],
                  args[1:], args[0])
 
if __name__ == "__main__":
    print(programming048(*sys.argv[1:]))
 
 

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