S1 = input()
S2 = input()
S3 = input()
S = S1 + S2 + S3
def IsAlternating(S):
  if len(S) < 1:
    return False
  elif len(S) == 1:
    return True
  elif len(list(set(list(S)))) != 2:
    return False
  else:
    FirstCharacter = S[0]
    SecondCharacter = S[1]
    for i in range(0, len(S)):
      if i % 2 == 0 and S[i] != FirstCharacter:
        return False
      elif i % 2 == 1 and S[i] != SecondCharacter:
        return False
  return True
if IsAlternating(S):
  print("Yes")
else:
  print("No")