#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cmath>
#include <iostream>
#include <queue>
#include <list>
#include <map>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <vector>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;


int main(){
  int A0, B0, C0;
  int A1, B1, C1;

  scanf("%d.%d.%d", &A0, &B0, &C0);
  scanf("%d.%d.%d", &A1, &B1, &C1);

  if(A0 < A1){
    cout << "NO" << endl;
    return 0;
  }
  if(A0 > A1){
    cout << "YES" << endl;
    return 0;
  }
  if(B0 < B1){
    cout << "NO" << endl;
    return 0;
  }
  if(B0 > B1){
    cout << "YES" << endl;
    return 0;
  }
  if(C0 < C1){
    cout << "NO" << endl;
    return 0;
  }
  if(C0 >= C1){
    cout << "YES" << endl;
    return 0;
  }
  
  return 0;
}