2292: Question 6: A difficult question

There are N Numbers, is between 0 to 9 (including 0 and 9).Now we want to know what kinds of Numbers of the N Numbers, and how many are there in the each number respectively?

There have multiple sets of test data.

Input an integer N in the first line of each sets of test data.

Output N numbers in the second line .

For each test data, output an integer K means appear K kinds of different numbers,

The next K lines, each line output two integers Ai and Bi, said Ai this number is present Bi.

5
5 5 2 2 1
6
1 9 9 2 3 0

3
1 1
2 2
5 2
5
0 1
1 1
2 1
3 1
9 2

Proposition：ZUFE_ZZT Translator：Angie