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 Go (1.6) (judge verdict: Accepted)

package main

import (
	"bufio"
	"os"
	"fmt"
	"strings"
	"strconv"
)

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	
	sum := 0

	for i := 1; scanner.Scan(); i++ {
		if err := scanner.Err(); err != nil {
			// エラー処理
			break
		}
		if i == 1 {
			data := fmt.Sprint(scanner.Text())
			data_format := strings.Split(data, " ")
			for k := 0; k < len(data_format); k++ {
				count, _ := strconv.Atoi(data_format[k])
				sum = sum + count
			}

			if sum >= 10 {
				fmt.Println("error")
			} else {
				fmt.Println(sum)
			}
			break
		}
	}

}