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:
for _ in range(int(input())):
    d,s=input().split()
    n=[int(i) for i in d]
    s=int(s)
    if sum(n)<=s:
        print(0)
    else:
        c=0
        t=len(n)
        for i in range(len(n)):
            if c+n[i]<s:
                c+=n[i]
            else:
                break
        f=d[i:]
        t=t-i
        g=10**t-int(f)
        print(g)