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:
# -*- coding: utf-8 -*-
"""
Created on Sun Sep  6 09:26:49 2020

@author: alber
"""

def divisibility(a,b):
    
    if a%b == 0:
        
        return 0
    
    elif b > a:
        
        return b-a
    
    else:
        
        return b - (a%b)
    












if __name__ == '__main__':
    
    x = int(input())
    
    for i in range(x):
        
        a, b = map(int,input().split())
        print(divisibility(a, b))