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To solve this problem, we need to find the maximum number of overlapping characters between two strings. Specifically, we check the longest suffix of one string that matches the prefix of the other string, and vice versa, then take the maximum of these values.

Approach

The approach involves two main checks:

1. Check suffix of first string vs prefix of second string: For all possible lengths from the minimum length of the two strings down to 1, check if the suffix of the first string (of that length) matches the prefix of the second string.
2. Check suffix of second string vs prefix of first string: Similarly, check if the suffix of the second string (of that length) matches the prefix of the first string.

We stop at the first valid match for each check since we start from the longest possible length, ensuring we get the maximum overlap for that case. The overall maximum from both checks gives the desired result.

Solution Code

def max_overlap(A, B):
    lenA = len(A)
    lenB = len(B)
    max_k = 0

    # Check A's suffix and B's prefix
    for k in range(min(lenA, lenB), 0, -1):
        if A.endswith(B[:k]):
            max_k = k
            break

    # Check B's suffix and A's prefix
    for k in range(min(lenA, lenB), 0, -1):
        if B.endswith(A[:k]):
            if k > max_k:
                max_k = k
                break

    return max_k

# Example usage (you can replace these with your input strings)
A = input().strip()
B = input().strip()
print(max_overlap(A, B))

Explanation

1. Length Calculation: We first compute the lengths of both strings to determine the maximum possible overlap length (minimum of the two lengths).
2. First Check: For the first string's suffix and the second string's prefix, we check from the longest possible length down to 1. The first valid match gives the maximum possible overlap for this case.
3. Second Check: We repeat the same process for the second string's suffix and the first string's prefix.
4. Result: The maximum value from both checks is the answer, representing the longest overlapping segment between the two strings.

This approach efficiently finds the maximum overlap with a time complexity of O(min(n, m)^2) (where n and m are the lengths of the strings), which is feasible for typical input sizes. The use of string slicing and endswith method simplifies the implementation and makes it readable.

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