a = int(input())

b = int(input())

for i in range(a, b + 1):

    print(i)

a = int(input())

b = int(input())

if a < b:

for i in range(a, b + 1):

        print(i)

else:

for i in range(a, b - 1, -1):

        print(i)

a = int(input())

b = int(input())

for i in range(a - (a + 1) % 2, b - b % 2, -2):

    print(i, end=' ')