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:
for s in[*open(0)][1:]:
 n,s=s.split();m='0'+n;i=j=t=0
 for x in m:
  t+=int(x)
  if t>=int(s)<sum(map(int,n)):m=m[:j]+chr(ord(m[j])+1)+'0'*(len(m)-j-1);break
  j=(j,i)[m[i]<'9'];i+=1
 print(int(m)-int(n))