250919

# import math
#
# sum=0
# arr=[[0, 1]]
# n=int(input())
# for i in range(1, n+1):
#     for j in range(1, i+1):
#         if math.gcd(i, j)==1:
#             arr.append([j, i])
#             sum+=1
#
# arr.sort(key=lambda x: x[0]/x[1])
# for i in range(sum+1):
#     print(arr[i][0], '/', arr[i][1], sep='')
#

arr=[]
for i in range(101):
    b=[]*i
    arr.append(b)
for i in range(4):
    y, x=map(int, input().split())
    arr[x
    ][y]=1
if arr[]=: