S=input()
t=input()
ans=10**18
if len(t)==1 and S.count(t)>0:
  print(-1)
  exit()
for i in range(1,len(t)):
    u=t[:i]+'.'+t[i:]
    s=S
    for i in range(len(t)+10):
      s=s.replace(t,u)
    cnt=s.count('.')
    ans=min(ans,cnt)
if ans==10**18:
  print(0)
  exit()
print(ans)