230819

# x, y = input().split()
# x = int(x)
# y = int(y)
#
# if y >= 30:
#     print(x, y-30)
# else:
#     if x == 0:
#         print(23, y+30)
#     else:
#         print(x-1, y+30)
# x, y = input().split()
# x = int(x)
# y = int(y)
#
# t = (x + 24) * 60 + y - 30
# print(t/60, t%60)
#a=현재 경기 타임, b=1반득점, c=2반득점
#1반 스코어=b+(90-a)//5
#2반 스코어=7
# a,b,c=input().split()
# a=int(a)
# b=int(b)
# c=int(c)
# t = 0
# if (90-a)%5==0:
#     t = b+(90-a)//5
# else:
#     t = b+((90-a)//5)+1
# if t > c:
#     print("win")
# elif t==c:
#     print("same")
# else:
#     print("lose")
# 반복문
# inclusive, exclusive
# for i in range(5):
#     print(i, end=' ')
# print()
#
# for i in range(1, 5+1):
#     print(i, end=' ')
# print()
#
# for i in range(0, 10, 2):
#     print(i, end=' ')
# print()
#
# for i in range(2, 20+1):
#     if i % 2 == 0:
#         print(i, end=' ')
# print()
#
# for i in range(20, 2, -1):
#     print(i, end=' ')
# print()
# n = int(input())
# data = input().split()
# print(data, type(data))
#
# for i in range(len(data)):
#     data[i] = int(data[i])
#
# print(data, type(data))
# for i in range(1,101):
#     print(i, end=' ')
# n=int(input())
# for i in range(1,n+1):
#     print(i, end=' ')
# a,b=input().split()
# a=int(a)
# b = int(b)
# if a < b:
#     for i in range(a,b+1):
#         print(i, end=' ')
# else:
#     for i in range(b, a+1):
#         print(i, end=' ')
# n=int(input())
# s = 0
# for i in range(1,n+1):
#     s += i
# print(s)
# n=int(input())
# s=0
# for i in range(1, n+1):
#     if i%2==0:
#         s+=i
# print(s)
# a,b=input().split()
# a=int(a)
# b=int(b)
# s=0
# for i in range(a,b+1):
#     if i%3==0:
#         s+=i
# print(s)
# n = int(input())
# data = input().split()
# s = 0
# for i in range(len(data)):
#     data[i] = int(data[i])
#     s += data[i]
#
# print(s)
# data = input().split()
# for i in range(0, 10):
#     if int(data[i])%5==0:
#         print(data[i])
#         break
#     elif int(data[i])%5!=0:
#         print("0")
#         break
# n = input()
# n = int(n)
# sum = 0
# data = input().split()
# for i in range(0, n):
#     sum = sum + int(data[i])
# print(sum)
# n = input()
# n = int(n)
# sum = 0
# k = input().split()
# for i in range(0, n):
#     if int(k[i])%2==1:
#         sum = sum + 1
# print(sum)
# n = input()
# n = int(n)
# sum = 0
#
# for i in range(1, n+1):
#     if i%10==1:
#         sum = sum + 1
# print(sum)
# k, h = input().split()
# k = int(k)
# h = int(h)
# if k%2==1:
#     a = (k+1)/2
# elif k%2==0:
#     a = k/2*10
# if h%2==1:
#     b = (h+1)/2
# elif h%2==0:
#     b = h/2*10
# print(int(a+b))
# n = input()
# n = int(n)
# sum = 0
# for i in range(1,n+1):
#     if n%i==0:
#         sum = sum + 1
# if sum>=3:
#     print("not prime")
# else:
#     print("prime")
# n = input()
# n = int(n)
# sum = 1
# for i in range(1,n+1):
#     sum = sum * i
# print(sum)
# n = input()
# n = int(n)
# sum = 0
# while True:
#     if n<10:
#         break
#
#     n = n/10
#     sum = sum + 1
#
# print(sum+1)

# a, b = input().split()
# a = int(a)
# b = int(b)
# if a%2==1:
#     for i in range(a, b+1):
#         if b+1-a%2==0:
#             c = -((b+1-a)/2)
#         else:
#             c = -((b-a)/2)+b
# elif a%2==0:
#     for i in range(a, b+1):
#         if b + 1 - a % 2 == 0:
#             c = ((b+1-a)/2)
#         else:
#             c = ((b-a)/2)-b
# print(int(c))

# n = input()
# n = int(n)
# sum = 0
# for i in range(2,n):
#     if n%i==0:
#         sum = sum + 1
#         a = i
# if sum>=3:
#     print(a, int(n / a), sep=' ')
# else:
#     print("wrong number")


# max = -1000000
# min = 1000000
# for i in range(0, 5):
#     x = int(input())
#     if max < x:
#         max = x
#     if min > x:
#         min = x
# print(max, min, sep = '\n')

# x = input()
# for i in range(len(x)):
#     print(ord('x')+3)

a, b  = input().split()
a = int(a)
b = int(b)
sum = 0
for i in range (a, b+1):
    if i%2==0:
        print(-i, sep='')
        sum = sum - i
    elif i%2==1:
        print(i, sep='')
        sum = sum + i