def non_input_count_names(experiment_proto):
  """Return names of all counts of non-inputs from an Experiment proto.

  Args:
    experiment_proto: selection_pb2.Experiment describing the experiment.

  Returns:
    List of strings in sorted order.
  """
  names = []
  for round_proto in experiment_proto.rounds.values():
    if round_proto.input:
      for reads in [round_proto.positive_reads, round_proto.negative_reads]:
        if reads.name:
          names.append(reads.name)
  return sorted(names)