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    Version 1:

    def twoStrings(s1, s2):
        for char in s1:
            if char in s2:
                return "YES"
        return "NO"
    

    Version 2:

    def twoStrings(s1, s2):
        return "YES" if any(char in s2 for char in s1) else "NO"
    

    Version 3:

    def twoStrings(s1, s2):
        return "YES" if set(s1) & set(s2) else "NO"