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:
for t in range(int(input())):
    n,s = list(map(int,input().split()))
    arr = [n]
    p = 1
    for i in range(19):
        num = n//p
        num = num*p
        num+=p
        p*=10
        arr.append(num)
    ans = 10**20
    for x in arr:
        t = x
        su = 0
        while t:
            su+=(t%10)
            t = t//10
        if su<=s:
            ans = min(ans,x-n)
    print(ans)