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 su(n):
    out=0
    for i in str(n):
        out+=int(i)
    return out

for _ in range(int(input())):
    n,s=map(int,input().split())
    op=0
    if su(n)<=s:
        print(op)
    else:
        while su(n)>s:
            x=list(str(n))
            x.reverse()
            i=0
            while x[i]=='0':
                i+=1
            op+=(10**i)*(10-int(x[i]))
            n+=(10**i)*(10-int(x[i]))
        print(op)