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:
# https://codeforces.com/contest/1409/problem/D
# D. Decrease the Sum of Digits

for _ in range(int(input())):
    n, s = map(int,input().split())
    value = sum(map(int, str(n)))
    p = 10
    ans = 0
    while value>s:
        v = n%p
        ans += p-v
        n += p-v
        p *= 10
        value = sum(map(int, str(n)))
        
    print(ans)