To print each region we must create our own list regionList. As we process each country we add the region to our list. The value we put in does not matter, we can use anything. Some regions will be added many times - this doesn't matter each simply over-writes the previous.

Print each region just once.

Print the number of regions.

Print the number of countries in each region. Use 35 characters for the region and 3 characters for the number.

For each region show the number of countries with a population of at least 10 million.

Print region and total population for those regions with a total population of at least 100 million.

Use 35 characters for the region name and 13 characters for the total population.