chet = 0
ne_chet = 0
a = [int(i) for i in range(30)]
for i in a:
    if a[i] % 2 == 0 and a[i] > chet:
        chet = a[i]
    if a[i] % 2 == 1 and a[i] > ne_chet:
        ne_chet = a[i]
print(chet - ne_chet)
print(a)