Well first off you better make 100% certain that your program exactly matches the output of the example. If your program does not match that, then it will definitely fail against the other sets of data that we test your program with. A helpful hint about your program, we give you a small sample of example input data, however we don't show you everything we test against. So it would be smart if you tested your program against more than just our example data set. Especially things that could possible cause your program to break IE: white space, new lines, integers, floats, negative numbers, etc, etc, etc. Test your program/code against all the types of input data as indicated in the problem statement and the example input data (together they paint a complete picture); there is a good chance that the example input data does not indicate all of our testing. You can use this handy one liner to compare the output of your program's output to the example input.