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.*;
import java.lang.*;
public class Main{
    public static void main(String[] args){
       Scanner sc = new Scanner(System.in);
       int t = sc.nextInt();
       while(t-->0){
           long a = sc.nextLong();
           long b = sc.nextLong();
           if(a%b==0){
               System.out.println("0");
           }
           else{
               long i = a/b;
               long r = b*(i+1);
               System.out.println(r-a);
           }
       }
    }
}