output_description: If Takahashi's statement is correct, print `Yes`; otherwise, print `No`.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      c_{1,1} c_{1,2} c_{1,3}
      c_{2,1} c_{2,2} c_{2,3}
      c_{3,1} c_{3,2} c_{3,3}
attempt: %import numpy as np
  c1 = [int(i) for i in input().split()]
  c2 = [int(i) for i in input().split()]
  c3 = [int(i) for i in input().split()]
  s = sum(c1) + sum(c2) + sum(c3)
  print(s % 3 == 0)
problem_description: Statement
  
  We have a 3 \times 3 grid. A number c_{i, j} is written in the square (i, j),
  where (i, j) denotes the square at the i-th row from the top and the j-th
  column from the left.  
  According to Takahashi, there are six integers a_1, a_2, a_3, b_1, b_2, b_3
  whose values are fixed, and the number written in the square (i, j) is equal
  to a_i + b_j.  
  Determine if he is correct.
samples: [{"input": "1 0 1\n    2 1 2\n    1 0 1", "output": "Yes\n    \n\nTakahashi is correct, since there are possible sets of integers such as:\na_1=0,a_2=1,a_3=0,b_1=1,b_2=0,b_3=1.\n\n* * *"}, {"input": "2 2 2\n    2 1 2\n    2 2 2", "output": "No\n    \n\nTakahashi is incorrect in this case.\n\n* * *"}, {"input": "0 8 8\n    0 8 8\n    0 8 8", "output": "Yes\n    \n\n* * *"}, {"input": "1 8 6\n    2 9 7\n    0 7 7", "output": "No"}]