start = int(input())
end = int(input())
string = ""
for i in range(start, end+1):
    for j in range(start, end+1):
        for k in range(start, end+1):
            for l in range(start, end+1):
                if l % 2 == 1 and i % 2 == 0 or i % 2 == 1 and l % 2 == 0 and i > l and j+k % 2 == 0:
                    print(str(i) + string + str(j) + string + str(k) + string + str(l) + " ", end='')