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>                                                              
                                                                                
int main(){                                                                     
  int A,B;                                                                      
  scanf("%d%d",&A,&B);                                                          
                                                                                
  if(A+B>9){                                                                    
    printf("error\n");                                                          
  }else{                                                                        
    printf("%d",A+B);                                                           
  }                                                                             
  return 0;                                                                     
}