You should implement the Map<Integer, String> Task.pivot(Map<String, Integer> map) method which takes the map. It
should pivot that map (swap the keys and values) and return it.
map.
For example, for the next input (in pseudocode):
Map(
"str1" => 10,
"str2" => 20
)
the method should return the net map:
Map(
10 => "str1",
20 => "str2"
)
Pay attention: The input map always has unique values. So you don't have to worry about duplicated keys in the result.