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():
    T = int(input())
    for _ in range(T):
        n, s = (int(i) for i in input().split())
        cur = sum(int(v) for v in str(n))
        ans = 0
        if cur <= s:
            print(ans)
        else:
            d = 0
            while cur > s:
                r = int(str(n)[::-1][d])
                if r == 0:
                    d += 1
                    continue
                ans += (10-r) * (10**d)
                n += (10-r) * (10**d)
                cur = sum(int(v) for v in str(n))
                d += 1
            print(ans)


if __name__ == '__main__':
    main()