#include <iostream>
using namespace std;
 
int main(){
	string S1, S2;
	cin >> S1 >> S2;
	string var1_1 = "", var1_2 = "", var1_3 = "", var2_1 = "", var2_2 = "", var2_3 = "";
	int now1 = 0;
	int now2 = 0;
	for(int i = 0; i < S1.size(); i++){
		if(S1[i] == '.'){
			now1++;
		}else if(now1 == 0){
			var1_1.push_back(S1[i]);
		}else if(now1 == 1){
			var1_2.push_back(S1[i]);
		}else if(now1 == 2){
			var1_3.push_back(S1[i]);
		}
		if(S2[i] == '.'){
			now2++;
		}else if(now2 == 0){
			var2_1.push_back(S2[i]);
		}else if(now2 == 1){
			var2_2.push_back(S2[i]);
		}else if(now2 == 2){
			var2_3.push_back(S2[i]);
		}
	}
	if(stoi(var1_1) > stoi(var2_1) || ((stoi(var1_1) == stoi(var2_1)) && (stoi(var1_2) > stoi(var2_2))) || ((stoi(var1_1) == stoi(var2_1)) && (stoi(var1_2) == stoi(var2_2)) && (stoi(var1_3) >= stoi(var2_3)))){
		cout << "YES" << endl;
	}else{
		cout << "NO" << endl;
	}
}