The Library of Mr. Severino
By Joao Marcos Salvanini Bellini de Moraes, IFSULDEMINAS 
Brazil
By Joao Marcos Salvanini Bellini de Moraes, IFSULDEMINAS Brazil
In a quiet country town, Mr. Severino has decided to set up his own library, as he collects several books since his youth. He knows nothing about programming, so he asked his grandson to make a program that registers and sorts his books by their code. However, his grandson is still in elementary school, and since he knows very little about programming, he ended up making a program that only registers the books, but doesn't sort them.
Thereby, Severino has turned to you, because he knows about your programming skills. Your task is simple: sort the books by their code.
The input consists of several test cases. The first line of each test case contains an integer N (1 ≤ N ≤ 1000). The subsequent N lines will have the books' code, which are always in the form "xxxx", that is, there will be no registration '1', for example, but "0001". Read input until EOF.
Print the registration of the books' code sorted. There's no newline between the test cases.
| Input Sample | Output Sample |
|
3 1233 0015 0100 7 0752 1110 0001 6322 8000 6321 0000 |
0015 0100 1233 0000 0001 0752 1110 6321 6322 8000 |