output_description: Print the correct choice.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      A
      B
attempt: #include <iostream>
  #include <vector>
  #include <climits>
  #include <algorithm>
  #include <unordered_map>
  #include <map>
  #include <cmath>
  #include <bitset>
  #include <queue>
  #include <set>
  #include <numeric>
  #include <unordered_set>
  
  using namespace std;
  
  #define ef emplace_front
  #define eb emplace_back
  #define mp make_pair
  #define MOD 1000000007
  
  typedef long double f80;
  typedef long long ll;
  typedef vector<int> vi;
  typedef vector<vi> vvi;
  typedef vector<ll> vll;
  typedef vector<vll> vvll;
  typedef vector<bool> vb;
  typedef vector<char> vc;
  typedef vector<string> vs;
  typedef pair<int, int> pi;
  typedef pair<ll, ll> pll;
  typedef vector<pi> vpi;
  typedef vector<pll> vpll;
  typedef vector<vb> vvb;
  typedef vector<vc> vvc;
  typedef vector<vs> vvs;
  typedef float f32;
  typedef double f64;
  typedef long double f80;
  typedef unordered_set<int> usi;
  typedef set<int> si;
  
  int main()
  {
  	cin.tie(0);
  	ios::sync_with_stdio(0);
  	
  	int a,b;
  	cin>>a>>b;
  	if (a!=1 && b!=1) cout<<1;
  	else if (a!=2&&b!=2) cout<<2;
  	else cout<<3;
  }
problem_description: Statement
  
  Takahashi is solving quizzes. He has easily solved all but the last one.
  
  The last quiz has three choices: 1, 2, and 3.
  
  With his supernatural power, Takahashi has found out that the choices A and B
  are both wrong.
  
  Print the correct choice for this problem.
samples: [{"input": "3\n    1", "output": "2\n    \n\nWhen we know 3 and 1 are both wrong, the correct choice is 2.\n\n* * *"}, {"input": "1\n    2", "output": "3"}]