题目描述
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-----
6 3
-----Sample Output-----
9
输入格式
见题面
输出格式
见题面
样例输入
6 3
样例输出
9