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:
a=int(input())
L=[]
for i in range(a):
    b = input()
    c=''
    for j in b:
        if j==' ':
            x=int(c)
            c=''
        else:
            c+=j
    L+=[[x,int(c)]]
for k in range(a):
    if L[k][0]%L[k][1]!=0:
        print(L[k][1]-L[k][0]%L[k][1])
    else:
        print(0)