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#include <iostream>
#include<stdio.h>
#include<stdlib.h>
#define ll long long
using namespace std;
int revit(ll a){
ll dig=0,rev=0;
do{
dig = a % 10;
a = a / 10;
rev = rev * 10 + dig;
}while(a>0);
return(rev);
}
int main() {
ll t,a,b;
cin>>t;
while(t--){
cin>>a>>b;
a=revit(a);
b=revit(b);
cout<<revit(a+b)<<"\n";
}
return 0;
}
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