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: Accepted)

#include<stdio.h>
#include<stdbool.h>
#include<string.h>
#include<math.h>
#include<stdlib.h>
#include<omp.h>
#define rep(i,n) for(int i=0; i <(n); i++)
int main(){
  int a,b;
  scanf("%d%d",&a,&b);
  if((a+b)>=10){
    printf("error\n");
  }else{
    printf("%d\n",a+b);
  }
  return 0;
}