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 (GCC 5.4.1) (judge verdict: Runtime Error)

#include<stdio.h>

void main() {
 int A;
 int B;
 
 scanf("%d" "%d",&A,&B);
 
 
 
 if(A + B < 10) {
   printf("%d", A + B);
 } else {
 
   printf("error");
 }
  
  return 0;
  
 }