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())):
    n,s=map(int,input().split())
    l=list(map(int,str(n)))[::-1]
    x=sum(l)
    if x<=s:
        print(0)
        continue
    for i in range(1,len(l)):
        if l[i]==9:
            continue
        t=l.copy()
        t[:i]=[0]*i
        t[i]+=1
        if sum(t)<=s:
            print(int(''.join(str(x) for x in t)[::-1])-n)
            break
    else:
        print(int('1'+'0'*len(str(n)))-n)