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.
s = input()
length = len(s)
count = 0
for i in range(length):
    for j in range(i+1,length):
        if s[i] == s[j]:
            print("no")
            count += 1
            break
    if count == 1:
        break
else:
    print("yes")

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