Second maximum word P89872

Write a program that prints the second largest word, in alphabetical order, of a given a sequence of words, ignoring repetitions.

For instance, if the words are “hola”, “adeu”, “hola”, “hi” and “bye”, then the asked word is “hi”, because it is not relevant that “hola” appears more than once.

Input

Input consists of several words, all made up of only lowercase letters. There will always be at least two different words.

Output

Print the second largest word in alphabetical order, ignoring repetitions.