import java.util.*;
import java.lang.*;
import java.io.*;

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);  
        int testCase = sc.nextInt(); 
        while(testCase --> 0)  {
            int a = sc.nextInt();
            int b  = sc.nextInt();
            int revA = reverse(a);
            int revB = reverse(b);
            int ans = reverse(revA + revB);
            System.out.println(ans);
        }
        
    }
    static int reverse (int x){
        int ans = 0;
        while(x > 0){
            int d = x % 10;
            ans  = ans * 10  + d;
            x = x /10;
        }
        return ans;
    }
}