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 Scala (2.11.7) (judge verdict: Accepted)

object Main extends App{ 
  val in = scala.io.StdIn.readLine().split(" ").map(_.toInt)
  val x = in(0)
  val y = in(1)
  val sum = x + y
 
    if(sum >= 10){
      println("error")
    }else{
      println(sum)
  }
}