#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <math.h>
#include <string.h>

int ToInt(char str[10]);
void Init(char* init);
void ParseNumArray(char* ver, int* intVer);

int main()
{
	char fossilVer[12] = "";
	char assessVer[12] = "";
	int fossil[3] = { 0 };
	int assess[3] = { 0 };
	int chrItr = 0;
	int intItr = 0;
	char buff[4] = "";

	scanf("%s", fossilVer);
	scanf("%s", assessVer);
	ParseNumArray(fossilVer, fossil);
	ParseNumArray(assessVer, assess);

	for (int i = 0;i < 3;i++)
	{
		if (fossil[i] > assess[i])
		{
			printf("YES\n");
			return;
		}
		else if (fossil[i] < assess[i])
		{
			printf("NO\n");
			return;
		}
	}

	printf("YES\n");
	return 0;
}

int ToInt(char str[10])
{
	int re_num = 0;
	for (int i = 0;str[i] != '\0';i++)
	{
		int num = str[i] - 48;
		if (num > 9 || num < 0)
		{
			return -1;
		}

		re_num = re_num * 10;
		re_num += num;
	}

	return re_num;
}

void Init(char* init)
{
	for (int i = 0;init[i] != '\0';i++)
	{
		init[i] = '\0';
	}
}

void ParseNumArray(char* ver, int* intVer)
{
	int chrItr = 0;
	int intItr = 0;
	char buff[4] = "";

	for (int i = 0;;i++)
	{
		if (ver[i] == '.' || ver[i] == '\0')
		{
			intVer[intItr] = ToInt(buff);
			intItr++;
			chrItr = 0;
			Init(buff);
			if (ver[i] == '\0')
			{
				break;
			}
			continue;
		}

		buff[chrItr] = ver[i];
		chrItr++;
	}
}