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>

int main(){
	char buf[10];
	int num1;
	int num2;
	int sum;
	
		fgets(buf,10,stdin);
		sscanf(buf,"%d %d",&num1,&num2);
	
		sum = num1 + num2;
	
	if(sum < 10)
		printf("%d \n",sum);
	else
		printf("error\n");
		
	return 0;
}