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:
from sys import stdin, stdout
n = int(stdin.readline())
q = list()
for i in range(0,n):
    l = stdin.readline()
    l = l.split(" ")
    l = [int(i) for i in l]
    if(l[1]>l[0]):
        q.append(l[1]-l[0])
    elif(l[0]%l[1]==0):
        q.append(0)
    else:
        q.append((((l[0]//l[1]+1)*l[1])-l[0]))
for i in q:
    print(i)