#include<iostream>
#include<cmath>

using namespace std;

int rev(int a)
{
    int temp = a;
    int rev = 0, flag = 0;
    while(temp>0)
    {
        int rem = temp%10;
        temp = temp/10;
        if(rem != 0){
            flag = 1;
        }
        if(rem == 0 && flag == 0){
            continue;
        }
        rev = rev*10 + rem;
    }
    return rev;
}

int main()
{
    int t;
    cin>>t;

    while(t--)
    {
        int a,b;
        cin>>a>>b;
        int rev_a = rev(a);
        int rev_b = rev(b);
        int ans = rev_a + rev_b;
        int rev_ans = rev(ans);
        cout<<rev_ans<<endl;
    }
    return 0;
}