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:
def solution(x):
    ans = []
    for i in range(len(x)):
        a, b = x[i]
        if a % b == 0:
            c = 0
        else:
            c = b - (a % b)
        ans.append(c)

    return ans



def main():
    t = int(input())
    x = []
    for i in range(t):
        a = list(map(int, input().split()))
        x.append(a)
    ans = solution(x)
    for i in range(len(ans)):
        print(ans[i])

if __name__ == "__main__":
    main()