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:
import math
 
 
class Read:
    @staticmethod
    def string():
        return input()
 
    @staticmethod
    def int():
        return int(input())
 
    @staticmethod
    def list(sep=' '):
        return input().split(sep)
 
    @staticmethod
    def list_int(sep=' '):
        return list(map(int, input().split(sep)))
 
    
def solve():
    a, b = Read.list_int()
    t = a % b
    print(b-t if t != 0 else 0)
    
    
# query_count = 1
query_count = Read.int()
while query_count:
    query_count -= 1
    solve()