import collections


def get_consensus_sequence(reads):
  """Gets simple consensus by taking the max character at each position.

  Args:
    reads: (list) DNA sequences.

  Returns:
    (str) A consensus DNA sequence.
  """
  n = len(reads[0])
  consensus = []
  for i in range(n):
    nuc_count = collections.Counter()
    for j in range(len(reads)):
      nuc_count[reads[j][i]] += 1
    consensus.append(nuc_count.most_common(1)[0][0])
  return "".join(consensus)