output_description: Print the converted string in a line. Note that you do not need to convert any
  characters other than alphabetical letters.
input_description: A string is given in a line.
attempt: print("".join(map(lambda x: [x.upper(), x.lower()][x.isupper()], input())))
  
problem_description: Toggling Cases
  
    
  
  Write a program which converts uppercase/lowercase letters to
  lowercase/uppercase for a given string.
samples: [{"input": "fAIR, LATER, OCCASIONALLY CLOUDY.", "output": "Fair, later, occasionally cloudy."}]