Problem:
Score : 100 points

Problem Statement

You are given two integers A and B as the input. Output the value of A + B.

However, if A + B is 10 or greater, output error instead.

Constraints

A and B are integers.

1 ≤ A, B ≤ 9

Input

Input is given from Standard Input in the following format:

A B

Output

If A + B is 10 or greater, print the string error (case-sensitive); otherwise, print the value of A + B.

Sample Input 1

6 3

Sample Output 1

9

Sample Input 2

6 4

Sample Output 2

error

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <iostream>
#include <cassert>
#include <vector>
#include <cmath>
#include <ctime>
#include <cstdlib>
#include <fstream>
#include <string>
#include <sstream>
#include <iterator>
#include <map>
#include <algorithm>
#include <memory>
#include <iomanip>
#include <limits>
#include <typeinfo>
 
#include <stdio.h>
#include <string.h>
 
 
using namespace std;
 
int main(int argc, char* argv[])
{

	int A,B;

	cin >> A >> B;

	cout << (A+B < 10 ? to_string(A+B) : "error") << endl;

	return 0;

}