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 (Clang 3.8.0) (judge verdict: Accepted)

    #include <stdio.h>
     
    int main(void){
        int A;
        int B;
        int c;
      scanf("%d %d " ,  &A, &B);
c = B + A;
if(c >= 10){
printf("error");}
else{
printf("%d",c);}

    }