s = str(input())
t = str(input())

import re
m = re.findall(t, s)
#print(m)

if len(t) == 1:
    if len(m) == 0:
        print(0)
    else:
        print(-1)
elif t == t[0]*len(t):
    s_ = s.replace(t, t[0])
    #print(s_)
    ans = len(m) + len(re.findall(t, s_))
    print(ans)
else:
    print(len(m))