#define _CRT_SECURE_NO_WARNINGS
#define M_PI 3.14159265358979
#include <iostream>
#include <stdio.h>
#include <string>
#include <math.h>
#include<iomanip>
#include<vector>
#include<cmath>
#include <algorithm>
#include <cstdlib>
#include <typeinfo>
using namespace std;



int main(){
	int n,m;
	string x, y,z;
	double a, b, c;
	cin >> n;
	for (int i = 0; i < n; i++)
	{
		cin >> x >> y;
		if (x.length() > 80 || y.length() > 80)
		{
			cout << "overflow" << endl;
		}
		else
		{
			a = stod(x);
			b = stod(y);
			if (to_string(a + b).length() > 80)
			{
				cout << "overflow" << endl;
			}
			else
			{
				z = to_string(a + b);
				z.erase(z.begin() + z.length() - 7, z.begin() + z.length());

				cout << z << endl;
			}
		}
	}
}