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#include <iostream>
using namespace std;
int main()
{
int a,b,c,d[10000];
cin >>a;
for(int i=0; i<a; i++){
cin >> b >> c;
d[i]=(c-b%c);
if(b%c==0){
d[i]=0;
}
else{
d[i]=(c-b%c);
}
}
for(int i=0; i<a; i++){
cout << d[i] << endl;
}
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