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

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    string S,T;
    cin>>S>>T;
    reverse(S.begin(),S.end());
    reverse(T.begin(),T.end());
    while(S.size()<10)S.push_back('0');
    while(T.size()<10)T.push_back('0');
    for(int i=0;i<S.size();i++)if(S[i]<T[i])
    {
        cout<<"No"<<endl;
        return 0;
    }
    cout<<"Yes"<<endl;
}