#include<iostream>

#include<list>

#include<string>

using namespace std;

list<int> BigAddList(list<int> La,list<int> Lb )

{

    list<int> Lc;

    list<int> ::iterator it1,it2;

    it1=La.begin();

    it2=Lb.begin();

    int carry=;

    while(it1!=La.end()||it2!=Lb.end())

    {

        int c=carry;

        if(it1!=La.end())

        {

            c=c+(*it1);

            it1++;

        }

        if(it2!=Lb.end())

        {

            c=c+(*it2);

            it2++;

        }

        carry=c/;

        Lc.push_back(c%);

     }

     if(carry>) Lc.push_back(carry);

     return Lc;

}

int main()

{

    int i,T;

    cin>>T;

    for(int j=;j<T;j++)

    {

        string s,t;

        cin>>s>>t;

        list<int>La,Lb,Lc;

        for(i=;i<s.size();i++)

        {

            La.push_front(s[i]-'');

         }

         for(i=;i<t.size();i++)

         Lb.push_front(t[i]-'');

         Lc=BigAddList(La,Lb);

         Lc.reverse();

         for(list<int>::iterator it=Lc.begin();it!=Lc.end();it++)

         {

             cout<<*it;

         }

         cout<<endl;

    }

}