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 (Python):

from __future__ import division, print_function
import sys


def main():
    a, b = map(int, sys.stdin.readline().strip().split(" "))
    print(a + b if a + b < 10 else "error")


if __name__ == '__main__':
    main()