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 9.2.1) (judge verdict: Accepted)

#include<stdio.h>
int cal(int *a);
int main(){
int a,b;
scanf("%d%d",&a,&b);
if((a>=1&&a<=9)&&(b>=1&&b<=9)){
a+=b;
cal(&a);
}
return 0;
}
int cal(int *a)
{
    if(*a<10){
        printf("%d\n",*a);
    }
    else{
        printf("error\n");
    }
}