output_description: If A + B is 10 or greater, print the string `error` (case-sensitive);
  otherwise, print the value of A + B.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      A B
attempt: #include<iostream>
  #include<iomanip>
  #include<cmath>
  #include<string>
  #include<cstring>
  #include<vector>
  #include<list>
  #include<algorithm>
  #include<map>
  #include<set>
  #include<queue>
  #include<stack>
  using namespace std;
  typedef long long ll;
  #define fi first
  #define se second
  #define mp make_pair
  #define mt make_tuple
  #define pqueue priority_queue
  const int inf=1e9+7;
  const ll mod=1e9+7;
  const ll mod1=998244353;
  const ll big=1e18;
  const double PI=2*asin(1);
  
  int main() {
    int A, B;
    cin>>A>>B;
    if(A+B>=10) cout<<"error"<<endl;
    else cout<<A+B<<endl;
  }
  
problem_description: 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.
samples: [{"input": "6 3", "output": "9\n    \n\n* * *"}, {"input": "6 4", "output": "error"}]