input: Write a python function that accepts a non-empty list of integers and calculates the sum of the even numbers that are positioned at odd indices.
  assert sum_even_at_odd_indices([4, 88]) == 88
  assert sum_even_at_odd_indices([4, 5, 6, 7, 2, 122]) == 122
  assert sum_even_at_odd_indices([4, 0, 6, 7]) == 0
  assert sum_even_at_odd_indices([4, 4, 6, 8]) == 12
output: def sum_even_at_odd_indices(lst):
      return sum(lst[i] for i in range(1, len(lst), 2) if lst[i] % 2 == 0)