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:
x=int(input())
c=[]
d=[]
for i in range(x):
    a,b=list(map(int,input().split()))
    c.append(a)
    d.append(b)
for i in range(x):
     if(c[i]%d[i]==0):
         print("0")
     elif(c[i]>d[i]):
        f=c[i]%d[i]
        print(d[i]-f)
     else:
        print(d[i]-c[i])