justin.java

public static void main(String args[]) {
{
  Scanner input = new Scanner (System.in);
  int purchases = 0; // init purchases
  char firstLetter;

  do
  {
    // TODO: print some shit on the screen here
    
    // all the things all at once
    firstLetter = Character.toLowerCase( input.nextLine().charAt(0) );

    if (firstLetter == 'p') {
      // process the purchase
      ++purchases; // or whatever you're supposed to do.
    }
  } while (firstLetter != 's'); // let's go do the next thing!
}