def merge(num1, num2):
arr3 = num1+num2
arr3.sort()
return arr3
arr1 = [3, 5, 6, 10]
arr2 = [1, 2, 7, 8, 11, 12]
assert merge(arr1, arr2) == [1, 2, 3, 5, 6, 7, 8, 10, 11, 12]
arr1 = [1, 3, 4, 5]
arr2 = [2, 4, 6, 8]
assert merge(arr1, arr2) == [1, 2, 3, 4, 4, 5, 6, 8]
arr1 = [5, 8, 9]
arr2 = [4, 7, 8]
assert merge(arr1, arr2) == [4, 5, 7, 8, 8, 9]