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:
def solve():
	n, s = [int(x) for x in input().split(' ')]
	t, c = list(str(n)), 0
	lt = len(t)
	for k, v in enumerate(t):
		c += int(v)
		if c >= s: 
			if (k == lt - 1 or int(''.join(t[k + 1:])) == 0) and c == s:
				return 0
			else:
				return int('1'+'0'*(lt - k)) - int(''.join(t[k:]))
	return 0
			

t = int(input())
for i in range(t):
    print(solve())