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 su(n):
    s= 0
    while n :
        rem = n%10
        n = n//10
        s+=rem
    return s
for _ in range(int(input())):
    n , s = map(int,input().split())
    pow =1
    move =0
    add =0
    while sum(map(int,str(n))) >s:
        last = (n//pow)%10
        #last digit calc
        add=pow*(10-last)
        #add of remaining number to make n to the smallest sum
        move +=add
        n+=add
        pow *=10
    print(move)