#include <bits/stdc++.h>
using namespace std;

//--------------------------------------------
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define RFOR(i,a,b) for(int i=(b)-1;i>=(a);i--)
#define REP(i,n) FOR(i,0,n)
#define RREP(i,n) RFOR(i,0,n)
#define LL long long
#define INF INT_MAX/3

//--------------------------------------------
const double EPS = 1e-14;
const double PI  = acos(-1.0);

//--------------------------------------------

int main(){
  int a,b,c;
  int x,y,z;

  scanf("%d.%d.%d",&a,&b,&c);
  scanf("%d.%d.%d",&x,&y,&z);

  bool flag = false; 
  if (a > x) flag = true;
  else if (a == x) {
    if (b > y) flag = true;
    else if (b == y) {
      if (c >= z) flag = true;
    }
  }
  if (flag) printf("YES\n");
  else printf("NO\n");
}