#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
#define REP(i, n)           for(int(i)=0;(i)<(n);++(i))
#define FOR(i, f, t)        for(int(i)=(f);(i)<(t);(++i))
const int MOD = int(1e9+7);

int N,M,W,H;
int res = 0;

int main(){
    int a,b,c,d,e,f; char p;
    cin >> a >> p >> b >> p >> c;
    cin >> d >> p >> e >> p >> f;

    int k1 = a*101*101+b*101+c;
    int k2 = d*101*101+e*101+f;

    cout << (k1>=k2?"YES":"NO") << endl;
    return 0;
}