#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <vector>
#include <functional>
#include <string>
#include <sstream>

std::vector<std::string> split(const std::string &str, char delim){
  std::vector<std::string> res;
  size_t current = 0, found;
  while((found = str.find_first_of(delim, current)) != std::string::npos){
    res.push_back(std::string(str, current, found - current));
    current = found + 1;
  }
  res.push_back(std::string(str, current, str.size() - current));
  return res;
}


int main(){
  std::string comp1;
  std::string comp2;
  std::cin >> comp1;
  std::cin >> comp2;
  std::vector<std::string> str = split(comp1,'.');
  std::vector<std::string> str2 = split(comp2,'.');
  int A0 = std::stoi(str[0]);
  int B0 = std::stoi(str[1]);
  int C0 = std::stoi(str[2]);
  int A1 = std::stoi(str2[0]);
  int B1 = std::stoi(str2[1]);
  int C1 = std::stoi(str2[2]);
  if(A0 > A1)
    std::cout << "YES" << std::endl;
  else if(A0 < A1)
    std::cout << "NO" << std::endl;
  else if(B0 > B1)
    std::cout << "YES" << std::endl;
  else if(B0 < B1)
    std::cout << "NO" << std::endl;
  else if(C0 >= C1)
    std::cout << "YES" << std::endl;
  else 
    std::cout << "NO" << std::endl;
  return 0;
}