#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int a,b,c,d,n;cin>>n;
  string r;
  map<int,bool> map;
  rep(i,10)map[i]=true;
  for(;n>0;n--){
    cin>>a>>b>>c>>d>>r;
    if(r=="YES"){
      rep(i,10){
        if(i==a)continue;
        if(i==b)continue;
        if(i==c)continue;
        if(i==d)continue;
        map[i]=false;
      }
    }else{
      map[a]=false;
      map[b]=false;
      map[c]=false;
      map[d]=false;
    }
  //for(auto itr = map.begin(); itr != map.end(); ++itr) { cout<<"key="<<itr->first<<",val="<<itr->second<<"\n"; } cout<<endl;
  }
 
  rep(i,10){
    if(map[i]){
      cout<<i<<endl;
      break;
    }
  }
}