#include <atcoder/all>
#include <bits/stdc++.h>
#define rep(i, a, b) for (ll i = (ll)(a); i < (ll)(b); i++)
using namespace atcoder;
using namespace std;

typedef long long ll;

int main() {
    int a, b;
    cin >> a >> b;
    rep(i, 0, 100) {
        if (a % 10 < b % 10) {
            cout << "No" << endl;
            return 0;
        }
    }
    cout << "Yes" << endl;
}