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 PYTHON3):

Solution:
import sys,math
input=sys.stdin.readline
t=int(input())
for r in range(t):
    a,b=map(int,input().split())
    if a>=b:
        if a%b==0:
            print(0)
        else:
            x=math.ceil(a/b)
            ans=int(b*x)-a
            print(ans)
    else:
        x=math.ceil(a/b)
        ans=int(b*x)-a
        print(ans)