Def readFile(filename): dict = {} with open(filename, 'r') as infile: lines = infile. readlines() for index in range(0, len(lines) - 1, 2): if lines[index].strip()=='':continue count = int(lines[index].strip()) name = lines[index + 1].strip() if count in dict. keys(): name_list = dict. get(count) name_list. append(name) name_list. sort() else: dict[count] = [name] print(count, name) return dict def output_keys(dict, filename): with open(filename,'w+') as outfile: for key in sorted(dict. keys()): outfile. write('{}: {}\n'.format(key,'; '.join(dict. get(key print('{}: {}\n'.format(key,';'.join(dict. get(key def output_titles(dict, filename): titles = [] for title in dict. values(): titles. extend(title) with open(filename,'w+') as outfile: for title in sorted(titles): outfile. write('{}\n'.format(title)) print(title) def main(): filename = input('Enter input file name: ') dict = readFile(filename) if dict is None: print('Error: Invalid file name provided: {}'.format(filename)) return print(dict) output_filename_1 ='output_keys. txt' output_filename_2 ='output_titles. txt' output_keys(dict, output_filename_1) output_titles(dict, output_filename_2