#include <iostream>
#include <unordered_set>
using namespace std;
 
int numJewelsInStones(string jewels, string stones) {
    unordered_set<char> jewelSet(jewels.begin(), jewels.end());
    int count = 0;
 
    for (char stone : stones) {
        if (jewelSet.count(stone)) {
            count++;
        }
    }
    return count;
}
 
int main() {
    string jewels = "aA";
    string stones = "aAAbbbb";
 
    cout << "Number of jewels in stones: " << numJewelsInStones(jewels, stones) << endl;
    return 0;
}
 

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