# coding: utf-8
# Your code here!
S=input()
T=input()


if T in S and len(T)==1:
    print(-1)
    exit()

ans=0
temp=""
for i in range(len(S)):
    temp+=S[i]
    if len(temp)>len(T):
        temp=temp[1:]
    if T==temp:
        ans+=1
        temp=S[i]
    #print(temp)
print(ans)