You are going to act as a Python interpreter. You will be given a valid python program below. Write down what you think the result of its execution would be. Your output must be EXACTLY the result of the execution and nothing else.
situation
system
def longest_common_string(str1, str2):
    max_str = ""
    m = len(str1)
    n = len(str2)

    for i in range(m):
        for j in range(n):
            current_str = ""
            k = 0
            while i + k < m and j + k < n and str1[i+k] == str2[j+k]:
                current_str += str1[i+k]
                k += 1
            if len(current_str) > len(max_str):
                max_str = current_str

    return max_str

print(longest_common_string("I love programming","I love solving puzzles"))
user
I love
assistant