S = gets.chomp
T = gets.chomp
N = T.size

if N == 1
  puts -1
  exit
end

stack = ''
ans = 0

S.each_char do |s|
  stack << s

  if stack[-N..-1] == T
    stack[-1] = '.'
    stack << s
    ans += 1
  end
end

puts ans