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
#1
def divisiblity(a,b):
    c = a%b
    if c == 0:
        return 0
    return (b-c)

cases = int(input())
for _ in range(cases):
    a,b = list(map(int,input().split()))
    print(divisiblity(a,b)) 

#2
def beautiful_string(n,k):
    a = int((math.sqrt(8*k + 1) - 1)/2) + 1
    b = k - int(a*(a-1)/2)
    if b == 0:
        s = 'a'*(n-a) + 'bb' + 'a'*(a-2)
        return s
    else:
        s = 'a'*(n-a-1) + 'b' + 'a'*(a-b) + 'b' + 'a'*(b-1)
        return s

# cases = int(input())
# for _ in range(cases):
#     n,k = list(map(int,input().split()))
#     print(beautiful_string(n,k))

#3
def ternary_xor(x):
    a = ''
    b = ''
    c = True
    for i in x:
        if i == '0':
            a += '0'
            b += '0'
        elif i == '1':
            if c:
                a += '1'
                b += '0'
                c = False
            else:
                a += '0'
                b += '1'
        else:
            if c:
                a += '1'
                b += '1'
            else:
                a += '0'
                b += '2'
    return (a,b)

# cases = int(input())
# for _ in range(cases):
#     l = input()
#     x = input()
#     (a,b) = ternary_xor(x)
#     print(a)
#     print(b)