import java.util.Scanner;
import java.math.BigInteger;
public class Main {
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
BigInteger a,b,s;
int n,i;
n=input.nextInt();
for(i=1;i<=n;i++)
{
a=input.nextBigInteger();
b=input.nextBigInteger();
s=a.subtract(b);
System.out.println(s);
}
}
}
import java.math.BigInteger;
public class Main {
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
BigInteger a,b,s;
int n,i;
n=input.nextInt();
for(i=1;i<=n;i++)
{
a=input.nextBigInteger();
b=input.nextBigInteger();
s=a.subtract(b);
System.out.println(s);
}
}
}
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