AOJ:0015

gistfile1.java

import java.util.Scanner;
import java.math.BigDecimal;

public class Main {
	public static void main(String[] args) {
		Scanner scn = new Scanner(System.in);
		int n = scn.nextInt();
		for(int i = 0; i < n; i++) {
			BigDecimal a = new BigDecimal(scn.next());
			BigDecimal b = new BigDecimal(scn.next());
			BigDecimal sum = a.add(b);
			if (a.toString().length() > 80 || b.toString().length() > 80
			|| sum.toString().length() > 80) {
				System.out.println("overflow");
			} else {
				System.out.println(sum);
			}
		}
	}
}