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

def set_debug(debug_mode=False):
    if debug_mode:
        fin = open('input.txt', 'r')
        fout = open('output.txt', 'w')

        sys.stdin = fin
        sys.stdout = fout


if __name__ == '__main__':
    # set_debug(True)

    t = int(input())
    for _ in range(t):
        a, b = map(int, input().split())
        mod = a % b
        if mod == 0:
            print(mod)
        else:
            print(b-mod)