output_description: Print the abbreviation for the N-th round of ABC.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      N
attempt: uk3zdbr9
  
problem_description: Statement
  
  This contest, _AtCoder Beginner Contest_ , is abbreviated as _ABC_.
  
  When we refer to a specific round of ABC, a three-digit number is appended
  after ABC. For example, ABC680 is the 680th round of ABC.
  
  What is the abbreviation for the N-th round of ABC? Write a program to output
  the answer.
samples: [{"input": "100", "output": "ABC100\n    \n\nThe 100th round of ABC is ABC100.\n\n* * *"}, {"input": "425", "output": "ABC425\n    \n\n* * *"}, {"input": "999", "output": "ABC999"}]