You are given two strings, jewels and stones. Each character in jewels represents a stone type that is a jewel, and each character in stones represents a stone you have. Count how many characters in stones belong to the set of characters in jewels.

Note: Matching is case-sensitive, so 'a' and 'A' are different types of stones.

Constraints:

• $1 \leq$ jewels.length, stones.length $\leq 50$

• jewels and stones consist of only English letters.

• All the characters of jewels are unique.

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