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    My Solution in Python 3

    def commonChild(s1, s2):
        n = len(s1)
        m = len(s2)
        
        # Initialize dp array
        dp = [[0] * (m + 1) for _ in range(n + 1)]
        
        # Build dp array
        for i in range(1, n + 1):
            for j in range(1, m + 1):
                if s1[i - 1] == s2[j - 1]:
                    dp[i][j] = dp[i - 1][j - 1] + 1
                else:
                    dp[i][j] = max(dp[i - 1][j], dp[i][j - 1])
        
        # The length of the longest common child
        return dp[n][m]