S = input().strip()
T = input().strip()

if len(T) == 1:
  print(-1)
  exit(0)

cnt = 0
pos = 0

while True:
  tmp = S.find(T, pos)
  if tmp > 0:
    cnt += 1
    S = S[:tmp - 1] + '.' + S[tmp - 1:]
    pos = tmp + len(T)
  else:
    break

print(cnt)