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++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <string.h>

int main(void) {
	char S[27];
	int A,i,len,j;
	scanf("%s",S);
	len=strlen(S);
	for(j=1;j<=len;j++){
		for(i=1;i<=len;i++){
			if(S[i-1]==S[j-1]){
				A++;
			}
	}
	}
	if(A==len){
		printf("yes");
	}
	else{
		printf("no");
	}
	return 0;
}