Contest: Task: Related: TaskB

Score : $100$ points

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.

- $A$ and $B$ are integers.
- $1 ≤ A, B ≤ 9$

Input is given from Standard Input in the following format:

$A$ $B$

If $A + B$ is $10$ or greater, print the string `error`

(case-sensitive); otherwise, print the value of $A + B$.

6 3

9

6 4

error