18 lines
568 B
Java
18 lines
568 B
Java
import java.util.Scanner;
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import java.math.BigInteger;
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public class Main{
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public static void main(String[] args) {
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Scanner sc = new Scanner(System.in);
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int t = sc.nextInt();
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while(t-->0){
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BigInteger a = new BigInteger(sc.next());
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BigInteger b = new BigInteger(sc.next());
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int max = Math.max(a.toString().length(), b.toString().length());
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String ans = a.subtract(b).abs().toString();
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while(ans.length()<max) ans = "0" + ans;
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System.out.println(ans);
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}
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}
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}
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