def Replace(matrix,b):
  for i in range(1,10):
    if 2 == matrix.count(i):
      return abs(b-i)
  return 0
      
  
a = str(raw_input())
b = str(raw_input())
c = str(raw_input())

matrix = []


matrix = matrix + [int(a[0])]
matrix = matrix + [int(a[2])]
matrix = matrix + [int(a[4])]
matrix = matrix + [int(b[0])]
matrix = matrix + [int(b[2])]
matrix = matrix + [int(b[4])]
matrix = matrix + [int(c[0])]
matrix = matrix + [int(c[2])]
matrix = matrix + [int(c[4])]

for i in range(1,10):
  if i not in matrix:
    b = i
    print Replace(matrix,b)