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 dig(n):
    sum = 0
    for i in str(n):
        sum += int(i)
    return sum

t = int(input())
for z in range(t):
    n,s = map(int,input().split())
    p = ''
    l = list(map(int,str(n).rstrip()))
    if dig(n)<=s:
        print(0)
    else:
        for i in range(len(l)-1,-1,-1):
            if l[i]>0:
                p+=str(10-l[i])
                l[i-1]+=1
            else:
                p+='0'
            if dig(int(p[::-1])+n)<=s:
                break
    print(p[::-1])