yoba = [ 0, 1, 4, 6, 3, 4, 0, 0, 4, 2, 4 ]
for i, x in enumerate(filter(lambda z: z > 0, yoba)):
    if i % 2 == 0:
        print('%d --1--' % x)
    else:
        print('%d --2--' % x)