In this task, you are provided with four sets of integers. Your task consists of selecting one integer from each set, such that their sum is 0. You can assume that exactly one such selection exists.
The first line of input contains four numbers, a, b, c, and d, separated by a space character, indicating the number of elements in each of the four sets. Each of these numbers is a positive integer 1 ≤ a, b, c, d ≤ 500. The following a + b + c + d lines contain the elements, each not smaller than -10,000 and not larger than 10,000. The elements of the first set are listed first, followed by the elements of the second set, etc.
3 2 4 2 5 17 -8 -13 19 6 -9 10 0 -14 7
17 -13 10 -14