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:
T = int(input())
while T:
  n, s= input().split()
  n = int(n)
  s = int(s)

  tmp = n
  sum = 0
  while tmp:
    sum += tmp % 10
    tmp //= 10
  
  x = 0
  tmp = n
  idx = 1
  while sum > s:
    i = idx
    while tmp:
      num10 = 10 ** i
      if tmp % num10:
        x += (num10 - tmp % num10)
        tmp += (num10 - tmp % num10)
        break
      i += 1
    n = tmp
    idx = i

    sum = 0
    while tmp:
      sum += tmp % 10
      tmp //= 10
    tmp = n
  print(x)
  T -= 1