#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); i++)
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<ll> vll;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef vector<vector<ll>> vvll;
const ll inf = 1e16;
const ll md = 1000000007;

bool ans[10];

int main() {
  rep(i,10) ans[i]=true;
  int n;
  cin>>n;
  rep(i,n){
    vi num(4);
    rep(j,4) cin>>num[j];
    string yn;
    cin>>yn;
    if (yn=="YES"){
      rep(k,10){
        if (count(num.begin(),num.end(),k)) continue;
        ans[k]=false;
      }
    }else{
      for(int k:num) ans[k]=false;
    }
  }
  rep(i,10) if (ans[i]){
    cout<<i<<endl;
    return 0;
  }
  return 0;
}