human
Solve the following python programming problem given the following code:
# %load code/MRSortByString.py
from mrjob.job import MRJob

class MRSortByString(MRJob):
    def mapper(self, _, line):
        """
        """
        l = line.split(' ')
        print l
        yield l[1], l[0]

    def reducer(self, key, val):
        yield key, [v for v in val][0]

if __name__ == '__main__':
    MRSortByString.run()

%run   code/MRSortByString.py data/numbers.txt
Given the above code, generate some markdown instructions for it.
assistant
#Here is Python code to print l
.

examine the sorting code
Do not run the block a second time