10887 - Concatenation of Languages Solution Python 

totalCase = int(input())
i = 1
while i <= totalCase:
    m, n = [int(x) for x in input().split()]
    mySet1 = set()
    for j in range(m):
        mySet1.add(input().strip())
    mySet2 = set()
    for j in range(n):
        mySet2.add(input().strip())
    mySet = set()
    for x in mySet1:
        for y in mySet2:
            mySet.add(x + y)
    print(f"Case {i}: {len(mySet)}")
    i += 1

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