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: Accepted)

#include <bits/stdc++.h>
#define For(i, begin, end) for(int i=begin;i<end;i++)
#define Rep(i, n) For(i,0,n)
#define Sort(v) sort(v.begin(),v.end())
using namespace std;

int main(){
  int A,B;
  cin>>A>>B;
  if(A+B>=10)cout<<"error";
  else cout<<A+B;

  return 0;
}