PROGRAMMING:Calculate grade average
Given the basic information of n students, including student number (a string composed of 5 digits), name (a non empty string less than 10 in length that does not contain white space characters) and score ([0100] integer), it is required to calculate their average score and output the list of students below the average in order.
###Input format:
Enter a positive integer n ($$$Le $$10) on one line. Then n lines, each line gives a student's information in the format of "student number, name and grade", separated by a space.
###Output format:
First, output the average score in one line, keeping 2 decimal places. Then according to the input order, each line outputs the name and student number of a student below the average line, with a space between them.
###Input example:
```in
five
00001 zhang 70
00002 wang 80
00003 qian 90
10001 li 100
21987 chen 60
```
###Output example:
```out
eighty
zhang 00001
chen 21987
```
answer：If there is no answer, please comment
###Input format:
Enter a positive integer n ($$$Le $$10) on one line. Then n lines, each line gives a student's information in the format of "student number, name and grade", separated by a space.
###Output format:
First, output the average score in one line, keeping 2 decimal places. Then according to the input order, each line outputs the name and student number of a student below the average line, with a space between them.
###Input example:
```in
five
00001 zhang 70
00002 wang 80
00003 qian 90
10001 li 100
21987 chen 60
```
###Output example:
```out
eighty
zhang 00001
chen 21987
```
answer：If there is no answer, please comment