output_description: Print the converted text.
input_description: A text including lower-case letters, periods, and space is given in a line.
  The number of characters in the text is less than or equal to 200.
attempt: w = input()
  print(w.upper())
  
problem_description: Capitalize
  
  Write a program which replace all the lower-case letters of a given text with
  the corresponding captital letters.
samples: [{"input": "this is a pen.", "output": "THIS IS A PEN."}]