## Problem

DAIICT college students want to attend an IPL match.

A total of  students from the college want to go while only  tickets are available for the match.

Determine how many students won't be able to book tickets.

### Input Format

• The first line of input will contain a single integer , denoting the number of test cases.
• Each test case consists of two space-separated integers  and  — the number of students wants to go and the total number of tickets available, respectively.

### Output Format

For each test case, output on a new line the number of students who won't be able to book tickets.

• 1≤�≤1000
• 1≤�,�≤105

### Sample 1:

Input

Output

4
5 3
5 7
4 1
8 8

2
0
3
0


### Explanation:

Test case 1: There are 5 students who want to go, and only 3 tickets are available. Hence 2 students won't be able to get tickets.

Test case 2: There are 5 students who want to go, and 7 tickets are available. So, every one of them will get the tickets.

Test case 3: There are 4 students who want to go, and only 1 ticket is available. Hence 3 students won't be able to get tickets.

Test case 4: There are 8 students who want to go, and 8 tickets are available. So, every one of them will get the tickets.