import collections


def count_nucleotydes_gatc(lines):
    """Read a secuence of nucleotyes and returns
    number of G/T/A/C found.
    """
    s = ''.join(lines)
    counter = collections.Counter(s)
    g = counter['G']
    a = counter['A']
    t = counter['T']
    c = counter['C']
    return (g, a, t, c)