output_description: Print the specified string (case-sensitive).
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      D
attempt: N, K = map(int, input().split(" "))
  H = [int(input()) for _ in range(N)]
  H.sort()
  tmax = 10**9
  for a in range(N - K + 1):
      h1, h2 = H[a], H[a + K]
      tmax = min(tmax, abs(h1 - h2))
      if tmax == 0:
          break
  print(tmax)
  
problem_description: Statement
  
  In some other world, today is December D-th.
  
  Write a program that prints `Christmas` if D = 25, `Christmas Eve` if D = 24,
  `Christmas Eve Eve` if D = 23 and `Christmas Eve Eve Eve` if D = 22.
samples: [{"input": "25", "output": "Christmas\n    \n\n* * *"}, {"input": "22", "output": "Christmas Eve Eve Eve\n    \n\nBe sure to print spaces between the words."}]