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def connect_two_str(s1, s2):
len1 = len(s1)
length = min(len1, len(s2))
k = max(range(0, length + 1), key=lambda i: i if s1[len1-i:]==s2[:i] else False)
return s1 + s2[k:]
if __name__ == "__main__":
print(connect_two_str('1234', '234567'))