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:


from math import *

def solution(p):
    l=[]
    for pair in p:
        if pair[0]%pair[1]==0:
            l.append(0)
        else:
            l.append(ceil(pair[0]/pair[1])*pair[1]-pair[0])
    return(l)



t=int(input())
lst=[]
for i in range(t):
    lst.append(list(map(int, input().split())))

result = solution(lst)

for j in result:
    print(j)