//#include <tourist>
#include <bits/stdc++.h>
//#include <atcoder/all>
using namespace std;
//using namespace atcoder;
typedef long long ll;
typedef long double ld;
typedef unsigned int uint;
typedef unsigned long long ull;

typedef pair<ll, ll> p;
const int INF = 1e9;
const double eps = 1e-7;
const ll LINF = ll(1e18);
const int MOD = 1000000007;
const int dx[4] = {0, 1, 0, -1}, dy[4] = {-1, 0, 1, 0};
const int Dx[8] = {0, 1, 1, 1, 0, -1, -1, -1}, Dy[8] = {-1, -1, 0, 1, 1, 1, 0, -1};
const long double pi = 4 * atan(1);
#define yes cout << "Yes" << endl
#define YES cout << "YES" << endl
#define no cout << "No" << endl
#define NO cout << "NO" << endl
#define rep(i, n) for (int i = 0; i < n; i++)
#define ALL(v) v.begin(), v.end()
#define debug(v)          \
    cout << #v << ":";    \
    for (auto x : v)      \
    {                     \
        cout << x << ' '; \
    }                     \
    cout << endl;
template <class T>
bool chmax(T &a, const T &b)
{
    if (a < b)
    {
        a = b;
        return 1;
    }
    return 0;
}
template <class T>
bool chmin(T &a, const T &b)
{
    if (b < a)
    {
        a = b;
        return 1;
    }
    return 0;
}
//cout<<fixed<<setprecision(15);有効数字15桁
//-std=c++14
//g++ yarudake.cpp -std=c++17 -I .
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }
vector<string> split(string str, char del) //delは区切りたい文字
{
    int first = 0;
    int last = str.find_first_of(del);

    vector<string> result;

    while (first < str.size())
    {
        string subStr(str, first, last - first);

        result.push_back(subStr);

        first = last + 1;
        last = str.find_first_of(del, first);

        if (last == string::npos)
        {
            last = str.size();
        }
    }
    if (str == result[0])
    {
        result.pop_back();
    }
    return result;
}
int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    string s, s1;
    cin>>s>>s1;
    vector<string> sv =split(s,'.');
    vector<string> sv1 = split(s1, '.');
    rep(i,sv.size()){
        if(sv[i]<sv1[i])return NO,0;
        if(sv[i]>sv1[i]) return YES,0;
    }
    YES;
}