import sys

S = input()
T = input()

if len(T) == 1 and T in S:
    print (-1)
    sys.exit()

now = ""
ans = 0

for i in S:

    if len(now)+1 >= len(T) and now[-1*(len(T)-1):] + i == T:
        now += "."
        ans += 1
    now += i

print (ans)