23 lines
643 B
Java
23 lines
643 B
Java
import java.util.Scanner;
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public class Main{
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static boolean eq(String a, String b){
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if(a.length() != b.length()) return false;
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for(int i=0; i<a.length(); i++){
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if(a.charAt(i) != b.charAt(i)) return false;
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}
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return true;
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}
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public static void main(String[] arg){
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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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String a = sc.next();
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String b = sc.next();
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if(!eq(a,b)) System.out.println(Math.max(a.length(), b.length()));
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else System.out.println("-1");
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}
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sc.close();
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}
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}
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