from typing import Tuple


def count_bases(dna: str) -> Tuple[int, int, int, int]:
    """ Count each of the bases in DNA """

    cnt_a, cnt_c, cnt_g, cnt_t = 0, 0, 0, 0
    for base in dna:
        if base == 'A':
            cnt_a += 1
        elif base == 'C':
            cnt_c += 1
        elif base == 'G':
            cnt_g += 1
        elif base == 'T':
            cnt_t += 1

    return (cnt_a, cnt_c, cnt_g, cnt_t)