A Sports Club is an organization formed in order to help its members develop interest in certain sports. Usually, members interested in the same sport are divided into groups and an expert trainer is responsible for training each group. In this TMA, it is required to help the head of a Sports Club for kids implement application to keep track of the kids (members of the club) and the sports they are interested in. Requirements: After a quick meeting with the head of the sports club, you got the following information:  It is required to store the whole data (all groups of all sports) in one collection.  Each group has a number, a trainer and they are interested in a certain sport (e.g. football). In addition, it contains many kids with flexibility of adding and removing kids within a given limit for the maximum number of kids who could be in the same group (where this limit is fixed and unified for all groups). Furthermore, there are other attributes (add at least 2 attributes from your choice). Group number is unique for each sport.

A Sports Club is an organization formed in order to help its members develop interest in certain sports.
Usually, members interested in the same sport are divided into groups and an expert trainer is responsible for training each group.
In this TMA, it is required to help the head of a Sports Club for kids implement application to keep track of the kids (members of the club) and the sports they are interested in.
Requirements:
After a quick meeting with the head of the sports club, you got the following information:
 It is required to store the whole data (all groups of all sports) in one collection.
 Each group has a number, a trainer and they are interested in a certain sport (e.g. football). In addition, it contains many kids with flexibility of adding and removing kids within a given
limit for the maximum number of kids who could be in the same group (where this limit is fixed and unified for all groups). Furthermore, there are other attributes (add at least 2 attributes from your choice). Group number is unique for each sport.
 Each trainer has a unique ID, a name and other attributes (add at least 3 attributes from your choice). He/she could train more than one sport.
 Each kid has a unique ID, a name and other attributes (add at least 2 attributes from your choice).
Moreover, you have been informed that the following operations happen frequently:
 Forming a new group
 Adding a kid to a specified group
 Removing a kid from a specified group
 Retrieving the average number of kids per group of a certain sport
 Displaying all groups in a format similar to the following:
sport1: groupNo1 groupNo2 groupNo3 ...
sport2: groupNo1 groupNo2 groupNo3 ...
...
where sports and groups are sorted in ascending order
 Saving all the groups into a text file Analysis:
Q1: There are common attributes and methods between kids and trainers. W