output_description: Print the specified string (case-sensitive).
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      D
attempt: a, b = (int(i) for i in input().split())
  
  list = []
  
  for i in range(a):
      list.append(int(input()))
  
  new_list = sorted(list)
  
  sabun = None
  
  for i in range(len(new_list) - 1):
  
      if i + b == len(new_list):
          break
  
      bbb = new_list[i + b - 1] - new_list[i]
  
      if sabun == None:
          sabun = bbb
          continue
  
      if sabun > bbb:
          sabun = bbb
  
  print(sabun)
  
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."}]