output_description: Print `delicious` if Takahashi found the food delicious; print `safe` if he
  neither found it delicious nor got a stomachache; print `dangerous` if he got
  a stomachache.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      X A B
attempt: x, a, b = map(int, input().split())
  
  if a-b > 0:
    print("delicious")
  
  if b > x
    print("safe")
  
  if b > x+1:
    print("dangerous")
problem_description: Statement
  
  Takahashi has a strong stomach. He never gets a stomachache from eating
  something whose "best-by" date is at most X days earlier. He gets a
  stomachache if the "best-by" date of the food is X+1 or more days earlier,
  though.
  
  Other than that, he finds the food delicious if he eats it not later than the
  "best-by" date. Otherwise, he does not find it delicious.
  
  Takahashi bought some food A days before the "best-by" date, and ate it B days
  after he bought it.
  
  Write a program that outputs `delicious` if he found it delicious, `safe` if
  he did not found it delicious but did not get a stomachache either, and
  `dangerous` if he got a stomachache.
samples: [{"input": "4 3 6", "output": "safe\n    \n\nHe ate the food three days after the \"best-by\" date. It was not delicious or\nharmful for him.\n\n* * *"}, {"input": "6 5 1", "output": "delicious\n    \n\nHe ate the food by the \"best-by\" date. It was delicious for him.\n\n* * *"}, {"input": "3 7 12", "output": "dangerous\n    \n\nHe ate the food five days after the \"best-by\" date. It was harmful for him."}]