favourite pen

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Ravi likes certain types of pens. We gave a set of pens to Ravi, he chooses only the pens with his favorite types. Print the number of pens Ravi chooses if two strings are given as input. One string $S1$ resembles the type of pens which Ravi likes. Another string $S2$ resembles the set given to Ravi. Letters are case sensitive, so "a" is considered a different type of pen from "A". ### Input - Th

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solution.cppC++17

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