allnums = [int(l.strip()) for l in open("9.dat").readlines() if l.strip()]
preamb, nums = allnums[0:25], allnums[25:]

def two_sum(nums, tgt):
  while(len(nums)):
    num = nums.pop(0)
    diff = tgt - num
    if diff in nums:
      return True
  return False

def find_a_num():
  while len(nums):
    num = nums.pop(0)
    if not two_sum(preamb[:], num):
      return num
    preamb.pop(0)
    preamb.append(num)

a = find_a_num()
print("a", a)

def find_b_seq(tgt):
  nums = allnums[:]
  while len(nums):
    acc = 0
    for i, n in enumerate(nums):
      acc += n
      if acc == tgt:
        return nums[:i]
    nums.pop(0)

b = sorted(find_b_seq(a))
print("b", b[0]+b[-1])