first_num = int(input())
second_num = int(input())

first = str(first_num)
second = str(second_num)
for i in range(int(first[0]), int(second[0])+1):
   for j in range(int(first[1]), int(second[1])):
       for k in range(int(first[2]), int(second[2])):
           for l in range(int(first[3]), int(second)):