s = input()
t = input()

ans = 0
i = 0
while i < len(s):
    ss = s[i:i+len(t)]
    if ss == t:
        if len(t) == 1:
            print(-1)
            exit()

        else:
            ans += 1
            i += len(t) - 2

    i += 1

print(ans)