Deleted Characters(keteki)

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Given a string A and another string B, string A can be converted to string B, by deleting some characters from string A. Create another string C such that it contains the characters deleted from A, while converting string A to B, in increasing order of position in string A. Print the lexicographic-ally smallest string C possible. Print "-1", if it is not possible to convert string A to string B

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solution.cppC++17

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