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: Wrong Answer)

    #include <stdio.h>
     
    int main(char arts[]){
    int A;
    int B;
    char buf[128];
    fgets(buf,128,stdin);
    sscanf(buf,"%d",&A); 
    fgets(buf,128,stdin);
    sscanf(buf,"%d",&B);
     
    if(A+B<10){
    printf("%d",A+B);
    }else{
    printf("error");
    }
    }