#include <iostream>
#include <cstdio>
 
using namespace std;
 
int jumlahKata(char *kata){
	int sizes = 0;
	int count = 0;
	while(kata[count] != 0){
		sizes++;
		count++;
	}
	return sizes;
}
 
 
int main() {
	char kata[100], isiKata[100];
	int result = 0;
	cin >> kata;
	cin >> isiKata;
	for(int i = 0; i < jumlahKata(kata); i++){
		int sizes = jumlahKata(isiKata);
		while(sizes){
			if(kata[i] == isiKata[sizes]){
				result++;
			}
			sizes--;
		}
	}
	cout << result << endl;
	return 0;
}

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