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>
#include <string.h>
   
int main() {
          int A;
          int B;
          scanf("%d %d", &A, &B);
          
          
          if((A + B) >= 10) {
          printf("error");
          printf("\n");
          } else {
          printf("%d",  (A + B));
          printf("\n");
          return 0;
      }     
  }