p03697 AtCoder Beginner Contest 063 - Restricted
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.

Examples

Input

6 3


Output

9


Input

6 4


Output

error
```python
a,s=map(int,input().split())
if a+s>=10:
  print("error")
else:
  print(a+s)
```