import sys


def main():
    input_data = sys.stdin.read().split()
    if input_data[0] and input_data[1]:
        j = input_data[0]
        s = input_data[1]
        ans = 0

        for i in j:
            ans += s.count(i)
        print(ans)
    else:
        print(0)

if __name__ == '__main__':
    main()