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(void){
    
    int A,B,tmp;
   
    do{
    scanf("%d%d",&A,&B);
    }while(A < 1 || B > 9);
    
    tmp = A + B;
    
    if(tmp >= 10){
        printf("error");
    }else{
        printf("%d",tmp);
    }
    
    return 0;
    
}