This one is too easy but included anyway for completeness (why not?)
Input Description ----------------- The first line of input will be an integer N, which is for the number of rows in each list. Each list has N-lines of two space-delimited strings: the first string will be the unique item name (without spaces), the second string will be the price (in whole-integer cents). The second list, following the same format, will have the same unique item-names, but with the correct price. Note that the lists may not be in the same order! Output Description ------------------ For each item that has had its price changed, print a row with the item name and the price difference (in cents). Print the sign of the change (e.g. '+' for a growth in price, or '-' for a loss in price). Order does not matter for output.