# Write a function that takes a list.
#
# For example if the two lists are [1,2,3] and [4,5,6,7],
# your code would return [5, 7, 9, 7]
#
# Do not use any built-in functions except len()

def combine_lists(lst1, lst2):










print(combine_lists([1, 2, 3], [4, 5, 6, 7]))