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 9.2.1) (judge verdict: Accepted)

#include <stdio.h>
 
int	main(void)
{
  int	i = 0;
  int	j = 0;
  
  scanf("%d %d", &i, &j);
  if (i + j > 9)
    printf("error");
  else
    printf("%d", i + j);
  return (0);
}