S = input()
T = input()
if len(T)==1:
    print(-1)
    exit()
i = 0
j = 0
cnt = 0
while i<len(S):
    if S[i]!=T[j]:
        if j==0:
            i+=1
        else:
            j=0
    else:
        if j==len(T)-1:
            cnt+=1
            j=0
        else:
            i+=1
            j+=1
print(cnt)