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:
# Author Hoang Kim Duc - FPT University Ha Noi Campus
# import sys
# sys.stdin = open('input.txt', 'r')
# sys.stdout = open('output.txt', 'w')

def getSum(n):
    m = str(n)
    summ = 0
    for i in m[::-1]:
        summ += int(i)
    return summ

t = int(input())
for i in range(0,t):
    n, s = map(int,input().split())
    i = 0
    ans = 0
    while getSum(n) > s:
        dg = n % 10
        n = n//10 + 1
        ans += (10**i) * (10-dg)
        i += 1 
    print(ans)