def is_impossible(s, t)
    return false if t.size > 1
    
    s.include?(t)
end

s = gets.chomp
t = gets.chomp

if is_impossible(s, t)
    puts -1
    return
end

cnt = 0
t_len = t.size

while true do
    idx = s.index(t)
    break if idx.nil?
    
    s = s[idx+t_len-1...]
    cnt += 1
end

puts cnt