Write a Java program which takes in an int n$,$ followed

by a list of n English words. The program should sort

the list of Strings according to how many unique

characters they contain. If two Strings contain the same

number of unique characters, then they should be

sorted alphabetically. The program should print out the

sorted list, with words containing the fewest number of

unique characters coming first.

Sample input

tree

paper

car

banana

Sample output

banana

car

tree

paper