S = input()
T = input()
if len(T)==1:
    print(-1)
    exit()
ans = 0
s = S
while T in s:
    i = s.index(T)
    ans += 1
    s = s[:i+len(T)-1] + '.' + s[i+len(T)-1:]
ans2 = 0
s = S[::-1]
t = T[::-1]
while t in s:
    i = s.index(t)
    ans2 += 1
    s = s[:i+len(t)-1] + '.' + s[i+len(t)-1:]
print(min(ans, ans2))