from os import system

examples = "111_examples"
system("mkdir " + examples)
system("wget http://isoptera.lcsc.edu/~seth/cs111/examples")
index_lines = open("examples").readlines()
system("rm examples")

for line in index_lines:
    if "a href" in line and not "?C=S" in line:
        example_filename =line.split('"')[7]
        system("wget http://isoptera.lcsc.edu/~seth/cs111/examples" + example_filename)
        system("mv " + example_filename + " " + examples)