100630: [AtCoder]ABC063 A - Restricted

Memory Limit:256 MB Time Limit:2 S
Judge Style:Text Compare Creator:
Submit:0 Solved:0

Description

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

Input

题意翻译

输入两个整数A、B。 如果A+B>=10,输出error。否则输出A+B的值。

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