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: Wrong Answer)

#include <stdio.h>

int main(){
    int n,s[100],tmp;
    int sum = 0;
    int i,j;

    scanf("%d",&n);

    for(i = 0;i < n;i++){
        scanf("%d",&s[i]);
    }

    /*sort*/
    for(i = 0;i < n - 2;i++){
        for(j = n - 2;j >= i;j--){
            if(s[j] > s[j + 1]){
                tmp = s[j];
                s[j] = s[j + 1];
                s[j + 1] = tmp;
            }
        }
    }

    for(i = 0;i < n;i++){
        sum += s[i];
    }

    for(i = 0;sum % 10 == 0;i++){
        if(s[i] % 10 == 0){
            s[i] = 0;
        }
        sum = 0;
        for(j = 0;j < n;j++){
            sum += s[j];
        }
        if(sum == 0){
            break;
        }
    }

    for(i = 0;sum % 10 == 0;i++){
        s[i] = 0;
        sum = 0;
        for(j = 0;j < n;j++){
            sum += s[j];
        }
        if(sum == 0){
            break;
        }
    }

    printf("%d\n",sum);

    return 0;
}