def print_m(m):
    s = ''
    for i in range(len(m)):
        for j in range(len(m[i])):
            s += str(m[i][j]) + ' '
        s += '\n'
    print(s)


def rotate(m):
    n = len(m)
    c = int((n + 1) / 2)
    f = int(n / 2)
    for x in range(c):
        for y in range(f):
            m[x][y], m[n - 1 - y][x] = m[n - 1 - y][x], m[x][y]
            m[n - 1 - y][x], m[n - 1 - x][n - 1 - y] = m[n - 1 - x][n - 1 - y], m[n - 1 - y][x]
            m[n - 1 - x][n - 1 - y], m[y][n - 1 - x] = m[y][n - 1 - x], m[n - 1 - x][n - 1 - y]
    return m


if __name__ == "__main__":
    a = [[1, 2], [3, 4]]
    print_m(rotate(a))