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:
N = int(input())
data = []
for i in range(N):
    data.append((input()).split())
    for j in range(2):
        data[i][j] = int(data[i][j])
def res(a):
    x = a[0]
    y = a[1]
    cnt = 0
    if x%y != 0:
        cnt = y - (x % y)
    else:
        cnt = x % y
    return str(cnt)

for i in range(N):
    print(res(data[i]) + '\n')