S = input()
T = input()

if len(S) == 1 or len(T) == 1:
    print(-1)
else:
    start = 0
    count = 0
    while True:
        index = S[start:].find(T)
        if index != -1:
            start = index+start
            start += len(T)-1
            count += 1
        else:
            print(count)
            break