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

int main(){
	ll a,b;
	cin>>a>>b;
	if(a<b){
		cout<<"No"<<endl;
		exit(0);
	}
	string s,t;
	s=to_string(a);
	t=to_string(b);
	ll idx=(ll)s.size()-1;
	for(ll i=(ll)t.size()-1;i>=0;i--){
		if(t[i]-'0'>s[idx]-'0'){
			cout<<"No"<<endl;
			exit(0);
		}
		idx--;
	}
	cout<<"Yes"<<endl;
}