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
x=int(input(""))
list=[]
z=0
for c in range(x):
	m,n=map(int,input().split())
	for y in range(100000000000000):
		if m/n == int(m/n):
			list.append(z)
			break
		elif m<n:
			z=n-m
			list.append(z)
			break
		elif m>n:
			k=m/n
			z=math.ceil(k)*n-m
			list.append(z)
			break
	z=0
print(*list, sep = "\n")