s = input()
t = input()


if set(list(t)) == set(["."]) and t in s or len(t) == 1:
    print(-1)
else:
    ans = 0
    tmp = ""
    for c in s:
        if len(tmp) == len(t):
            tmp = tmp[1:]
        tmp += c
        if tmp == t:
            ans += 1
            tmp = tmp[-1]
    print(ans)