#include <iostream>
using namespace std;

int trans(int a)
{
 	if(a % 10 == 0)
    {
 	    while(a % 10 == 0)
 	    {
		    a = a / 10;
		}
	}
	return a;
}

int reverse(int b)
{
 	int c = 0;
 	while(b)
 	{
		c = c * 10 + b % 10;
		b = b / 10;
	}
	return c;
}

int main()
{
 	int n, a, b, sum;
 	int i, j, k;
 	cin>>n;
 	while(n--)
 	{
  	    cin>>a>>b;
  	    a = trans(a);
  		b = trans(b);
  		a = reverse(a);
  		b = reverse(b);
  		sum = trans(a+b);
  		sum = reverse(sum);
  		cout<<sum<<endl;
  	}
 	//system("pause");
 	return 0;
}