s = input()
t = input()
num = s.count(t)
if len(t) == 1 and num > 0:
    print(-1)
    exit()

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

print(ans)