#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cassert>
#include <vector>
#include <string>
#include <cmath>
#include <map> 
using namespace std;
 
const int MAX= 10000100;

#define loop(i,a,b) for(int i = a ; i < b ; i ++)
#define rep(i,a) loop(i,0,a)
#define all(a) (a).begin(),(a).end()
#define ll long long int
#define gcd(a,b) __gcd(a,b)

int GCD(int a, int b) {if(!b) return a; return gcd(b, a%b);}
int lcm(int a, int b) {return a*b / gcd(a, b);}

int main(void){
  char ina[1000],inb[1000];
  cin>>ina>>inb;
  int a,b,c;
  int d,e,f;
  sscanf(ina,"%d.%d.%d",&a,&b,&c);
  sscanf(inb,"%d.%d.%d",&d,&e,&f);
  if(a>=d)cout<<"YES";
  else if(a>=d&&b>=e)cout<<"YES";
  else if(a>=d&&b>=e&&c>=f)cout<<"YES";
  else cout<<"NO";
  cout<<endl;
}