#include<bits/stdc++.h>
using namespace std;
int rev(int a){
int result = 0;
while (a > 0)
{
result *= 10;
result += (a % 10);
a /= 10;
}
return result;
}
int main(){
int n,x,y,sum=0;
cin >> n;
while(n>0){
cin >> x >> y;
sum=rev(rev(x)+rev(y));
cout << sum;
n–;
}
}