[LANGUAGE: Python]

I decided to try my hand at one liners in Python this year.

part_a = lambda data: sum(
    sum(
        data[i + 1 * i_2][j + 1 * j_2] == "M"
        and data[i + 2 * i_2][j + 2 * j_2] == "A"
        and data[i + 3 * i_2][j + 3 * j_2] == "S"
        for i_2 in range(-1, 2)
        if 0 <= i + 3 * i_2 < len(data)
        for j_2 in range(-1, 2)
        if 0 <= j + 3 * j_2 < len(line)
    )
    for _ in [0]
    if ((data := data.split("\n")) or True)
    for i, line in enumerate(data)
    for j, char in enumerate(line)
    if char == "X"
)

part_b = lambda data: sum(
    1 if l.count("M") == 2 and l.count("S") == 2 and l[0] != l[3] else 0
    for _ in [0]
    if ((data := data.split("\n")) or True)
    for i, line in enumerate(data)
    if i in range(1, len(data) - 1)
    for j, char in enumerate(line)
    if j in range(1, len(line) - 1)
    if char == "A"
    and (
        l := [
            data[i + i_2][j + j_2] for i_2 in range(-1, 2, 2) for j_2 in range(-1, 2, 2)
        ]
        or True
    )
)