There are given two files: a file with information on flights and a file with information on passengers. The

file with information on flights has the format as follows:

flight$\_$id;city$\_$from;departure$\_$time;arrival$\_$time;city$\_$to

Each flight has a unique ID$.$ The file with information on passengers has the format as follows:

name;flights

Each passenger has a unique name. Field flights is a list of flight IDs, separated by comma.

Write a program that uses the information in these files to create file $$cities$.$txt$$ with a list of passengers

and cities they visited. The output file will have the format as follows:

name;cities