lines = [x.strip() for x in open('input', 'r').readlines()]

east = 0
north = 0
# 0 = E, 1 = N, 2 = W, 3 = S

wp_east = 10
wp_north = 1


def serialize():
    """Debug a position"""
    return f'N{north} E{east} / N{wp_north} E{wp_east}'


def rot90(x, y):
    """Rotates counter clockwise"""
    return [-y, x]


for line in lines:
    pos = serialize()
    command = line[0]
    number = int(line[1:])

    if command in ['S', 'W', 'R']:
        number *= -1

    if command in ['N', 'S']:
        wp_north += number
    elif command in ['E', 'W']:
        wp_east += number
    elif command in ['R', 'L']:
        number = number // 90 % 4
        for _ in range(number):
            wp_east, wp_north = rot90(wp_east, wp_north)
    elif command in ['F']:
        north += wp_north * number
        east += wp_east * number
    else:
        raise Exception(f'Unknown command: {command}')

    print(f'{line}: \t{pos} -> {serialize()}')

print()
manhattan = abs(north) + abs(east)
print('Solution')
print(manhattan)