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)-len(t)+1):
    if key:
        key -= 1
        continue
    if s[i:i+len(t)] == t:
        ans += 1
        key = len(t)-2

print(ans)