import java.util.Scanner;
import java.util.Arrays;

class Main {

 public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int cases = sc.nextInt();

    while(cases-- > 0) {
    String firstWord = sc.next();
    String secondWord = sc.next();
    if(firstWord.length() == secondWord.length()) {
      String sortedFirstName = sort(firstWord);
      String sortedSecondName = sort(secondWord);
      if(sortedFirstName.equals(sortedSecondName)) {
        System.out.println("Yes");
        continue;
      }
    }

    System.out.println("No.");
    }
 }

 public static String sort(String name) {
     char[] names = name.toCharArray();
     Arrays.sort(names);
    return new String(names);
 }

}