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,sys 
t=int(sys.stdin.readline())
#t=1
for _ in range(t):
    #n=int(sys.stdin.readline())
    a,b=map(int,sys.stdin.readline().split())
    #l=list(map(int,sys.stdin.readline().split()))
    #s=input()
    x=a%b
    y=a//b
    c=(((y+1)*b-a))
    if c==b:
        print(0)
    else:
        print(c)
    #print(x)