s = input()
t = input()

if len(t) <= 1:
    if t in s:
        print(-1)
    else:
        print(0)
    exit()
if all((t[0] == t[i] for i in range(len(t)))):
    ans = 0
    j = 0
    while j < len(s):
        k = j
        while k < len(s) and s[k] == s[j]:
            k += 1
        if s[j] == t[0]:
            ans += (k - j - 1) // (len(t) - 1)
        j = k
    print(ans)
else:
    ans = 0
    cur = 0
    while cur < len(s):
        try:
            pos = s.index(t, cur)
            cur = pos + len(t)
            ans += 1
        except ValueError:
            break
    print(ans)