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 Python (2.7.6) (judge verdict: Runtime Error)

testSNs = raw_input().split()
SCORE=int(0)
for x in range(testSNs[0]):
    if not testSNs[x]%10 is 0:
        SCORE += testSNs[x]
    else:
        continue
print(SCORE)