yoba = [ 0, 1, 4, 6, 3, 4, 0, 0, 4, 2, 4 ]
for i, x in enumerate(filter(lambda z: z > 0, yoba)):
    sign = 1 if i % 2 == 0 else -1
    angle = 90 * sign
    print('{} {}'.format(x, angle))