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 main(a, b):
    if (a % b) == 0:
        return 0
    else:
        index = (int(a/b) + 1)*b
        return abs(index - a)


if __name__ == '__main__':
    t = int(input())
    for t_itr in range(t):
        ab = list(map(int, input().rstrip().split()))
        a = ab[0]
        b = ab[1]
        res = main(a, b)
        print(res)