LINQ
A sequence of non-empty strings of Latin alphabet characters stringList is given.
Among all strings of the same length, sorted in ascending order, select the last character from
each string, converting it to uppercase, and from the received characters, compose a string.
Arrange the resulting sequence of strings in descending order of their lengths.
Among all strings of the same length, sorted in ascending order, select the last character from
each string, converting it to uppercase, and from the received characters, compose a string.
Arrange the resulting sequence of strings in descending order of their lengths.
