#include <iostream>
using namespace std;
int f(int n){
    int r,sum=0;
    while(n>0){
        r=n%10;
        n=n/10;
        sum=sum*10+r;
    }
    return sum;
}
int main() {
    int n,a,b;
    cin>>n;
    while(n--){
        cin>>a>>b;
        cout<<f(f(a)+f(b))<<endl;
    }
    return 0;
}