#include <iostream>
#include <cstdio>
#include <algorithm>
#include <string>
#include <cstring>
#include <cctype>
#include <cmath>
#include <stack>
#include <queue>
#include <vector>
#include <set>
#include <map>
#include <list>
#include <stdio.h>
#include <string.h>
#include <cstdlib>
#include <math.h>
#include <bitset>
#include <iterator>
#include <iomanip>
#include <sstream>
#define INF 2000000000
using namespace std;
int dx[4]={1,0,-1,0},dy[4]={0,1,0,-1};
#define sym cout<<"---------"<<endl;
#define ll long long
#define PL pair<long long, long long>
#define P pair<int,int>
#define mk make_pair
#define en endl
#define WHITE 0
#define BLACK 2
#define GRAY 1
#define RE return 0
#define int ll

int x[100005];

signed main(){
  int a,b,c;
  char d,e,f;
  cin>>a>>d>>b>>e>>c>>f;
  int aa,bb,cc;
  char dd,ee,ff;
  cin>>aa>>dd>>bb>>ee>>cc>>ff;
  if(a>aa){
    cout<<"YES"<<en;
    RE;
  }else if(a<aa){
    cout<<"NO"<<en;
    RE;
  }else if(a==aa){
    if(b>bb){
      cout<<"YES"<<en;
      RE;
    }else if(b<bb){
      cout<<"NO"<<en;
      RE;
    }else{
      if(b==bb){
        if(c<cc){
          cout<<"NO"<<en;
          RE;
        }else{
          cout<<"YES"<<en;
          RE;
        }
      }
    }
  }
}