Word Sorting

Problem Background

Special for beginners, ^_^

Problem Description

Input a sequence of words on one line, where adjacent words are separated by one or more spaces. Output these words in lexicographic (dictionary) order, printing each distinct word only once. (Case-sensitive.)

Input Format

One line of words: at least $1$ and at most $100$ words, each word no longer than $50$ characters, separated by at least one space. The data contains no characters other than letters and spaces.

Output Format

Output the words in lexicographic order, printing each distinct word only once.

Sample Input

She  wants  to go to Peking University to study  Chinese

Sample Output

Chinese
Peking
She
University
go
study
to
wants

Constraints

Time limit: 1s, memory limit: 1024KiB for each test case.

Hint

Comparison is case-sensitive: She and she are considered different words.