You are given a list of integers and an integer target, return a list of a pair of numbers in any order such that they add up to target. If there is no such pair of numbers, then return an empty list
Q: [9, 33, 7, 8, 2, 1, 10, 26, 15, 23, 22, 43, 36, 29, 42, 19, 37, 47, 13, 49], target=77
A: 
[]