problem.md

Problem 771: Jewels and Stones

Difficulty: Easy

Problem

You're given strings J representing the types of stones that are jewels, and S representing the stones you have. Each character in S is a type of stone you have. You want to know how many of the stones you have are also jewels.

The letters in J are guaranteed distinct, and all characters in J and S are letters. Letters are case sensitive, so "a" is considered a different type of stone from "A".

Example

Input: J = "aA", S = "aAAbbbb"
Output: 3