import sys

s = input()
t = input()
ans = 0
key = 0

if len(t) == 1:
    for i in range(len(s)):
        if s[i] == t:
            print(-1)
            sys.exit()

for i in range(len(s)):
    if s[i-key:i+1] != t[:key+1]:
        key = 0
    else:
        key += 1
    if key == len(t):
        ans += 1
        key = 0
        if s[i] == t[0]:
            key = 1

print(ans)