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(void) {
          int A;
          int B;
          int C;
          char buf[128];
          fgets(buf, 128, stdin);
          sscanf(buf, "%d", &A);
          fgets(buf, 128, stdin);
          sscanf(buf, "%d", &B);
          C = A + B;
          if(C >= 10) {
          printf("error");
          printf("\n");
          } else {
          printf("%d",  C);
          printf("\n");
          return 0;
      }     
  }