#include<stdio.h>

int main(void){

int A0,B0,C0,A1,B1,C1;
int dummy=0;
int ver1,ver2;

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

ver1= A0*1000000 +B0*1000 +C0; 
ver2= A1*1000000 +B1*1000 +C1;

if(ver1>=ver2)
printf("YES");

else
printf("NO");

return 0;

}