--------- INSTRUCTION --------- START
environments:
    java version: 1.7.0_40
    IDE tools: IntelliJ IDE 14.13

assumptions:
    1.every line in the input files is like "* at 10.25(price of items)";
    2.every line in the input files is like "* imported * at 10.25(price of items)" if the item is imported;
    3.there is a dictionary in my program, which includes all items belong to book, food, medical products, we can change the dictionary by modifying the file respectively;

how to build and run:

--------- INSTRUCTION --------- END

jozaefl6