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,b = map(int,input().split())
#lis = list(map(int,input().split()))
print(a+b if a+b >= 10 else "error")
a,b = map(int,input().split())
#lis = list(map(int,input().split()))
print("error" if a+b >= 10 else a+b)