S = input()
T = input()
if len(T)==1 and S.count(T)>0:
    print(-1)
    exit()

cnt = 0
temp = S.find(T)
while temp>=0:
    S = S[:temp+len(T)-1] + '.' + S[temp+len(T)-1:]
    temp = S.find(T)
    cnt+=1

print(cnt)