Assume that a file orderline.txt contains information about the products included in the orders submitted by the customers. For example, the first five rows in a sample file with the information about the ordered products contain the following lines.

000001 01 C001 bolt 200
000001 02 C001 screw 20
000002 01 C002 bolt 100
000002 02 C002 nut 50
000003 01 C002 screw 10

The first value in each line is an order number, for example, 000001 in the first line. The next value in each line is a line number in on order, for example, 01 in the first line. The next value in each line is a customer code, for example, C001 in the first line. The next value in each line is a name of an item ordered by a customer, for example, bolt in the first line. Finally, the last value in each line is the total number of items ordered, for example, 200 in the first line.

Assume, that a file orderline.txt has been loaded to HDFS. The location of the file is up to you.

Your task is to explain how to implement a MapReduce application, that finds the total number of ordered items per item. For example, when applied to the first five lines your application should return the following lines.
bolt 300
screw 30
nut 50

You must specify the parameters(if any) of your application and the key-value data in the input and output of the Map and Reduce stages.

There is no need to write Java code, however, if you like it then it is all right to do so. The precise explanation in plain English or in pseudocode will do.