S = input()
T = input()
cnt = -1
lt = list(T)
lt.insert(-1,'-')
Tr = ""
for i in lt:
    Tr += i
if len(list(T)) == 1 and T in S:
    cnt = -1
elif not T in S:
    cnt = 0
elif T in S:
    cnt = S.count(T)
    Sr = S.replace(T,Tr)
    if T in Sr:
        cnt += Sr.count(T)
print(cnt)