def get_alignment_size(alignment_tuple):
    """Get alignment length from alignment tuple.

    Given tuple (aln_name, aln_dict) get len of random sequence in {taxon: sequence} alignment dict."""
    alignment_name, alignment_dict = alignment_tuple
    seq_length = len(next(iter(alignment_dict.values())))
    total_alignment_size = seq_length * len(alignment_dict.values())
    return total_alignment_size
