Problem: You are given a positive integer n. In one move, you can increase n by one (i.e. make n := n + 1). Your task is to find the minimum number of moves you need to perform in order to make the sum of digits of n be less than or equal to s.

You have to answer t independent test cases.

Input

The first line of the input contains one integer t (1 ≤ t ≤ 2 ⋅ 10^4) — the number of test cases. Then t test cases follow.

The only line of the test case contains two integers n and s (1 ≤ n ≤ 10^{18}; 1 ≤ s ≤ 162).

Output

For each test case, print the answer: the minimum number of moves you need to perform in order to make the sum of digits of n be less than or equal to s.

Example

Input


5
2 1
1 1
500 4
217871987498122 10
100000000000000001 1


Output


8
0
500
2128012501878
899999999999999999

Solution (in JAVA):

Solution:
import java.util.Scanner;

public class App {

	public static void main(String[] args) {
		Scanner in=new Scanner(System.in);
		int n=in.nextInt();
		long a,b;
		for(int i=0;i<n;i++) {
			a=in.nextInt();
			b=in.nextInt();
			if(a<b) {
				System.out.println(b-a);
			}
			else if(a%b==0)
				System.out.println(0);
			else
				System.out.println((b*((a/b)+1))%a);
		}

	}

}