#include <bits/stdc++.h>
#define PB push_back
#define MP make_pair
#define REP(i,n) for (int i=0;i<(n);i++)
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define ALL(a) (a).begin(),(a).end()
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
const ll MOD=1e9+7;
int main(){
      int in[2][3];
      char com;
      int ans=1;
      REP(i,2){
            cin>>in[i][0]>>com>>in[i][1]>>com>>in[i][2];
      }
      REP(i,3){
            if(in[0][i]!=in[1][i]){
                  if(in[1][i]>in[0][i]) ans=2;
                  break;
            }
      }
      if(ans==1)cout<<"YES"<<endl;
      else cout<<"NO"<<endl;
}