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 sys
import heapq
 
def input():
    return sys.stdin.readline().strip()
 
def iinput():
    return int(input())
 
def rinput():
    return map(int, input().split())
 
def rlinput():
    return list(map(int, input().split()))
 
def main():
    # n = int(sys.stdin.readline().strip())
    a, b = rinput()
    print(((b - a % b) != b) * (b - a % b))
for i in range(iinput()):
    main()