#include <string>
#include <iostream>
#include <cstdio>
#include <memory.h>
using namespace std;
bool findsub(string a,string b)
{
    if(a.size()>b.size())
        return false;
    else
    {
        int loc=-1;
        for(int i=0;i<a.size();i++)
        {
            loc=b.find(a[i],loc+1);
            if(loc==string::npos)
                return false;
        }
        return true;
    }

}
int main()
{
	//freopen("d:\\in.txt","r",stdin);
	//freopen("d:\\out.txt","w",stdout);
    string a,b;
	a.resize(100000);
	b.resize(100000);
    while(cin>>a>>b)
    {
        if(findsub(a,b))
            cout<<"Yes"<<endl;
        else
            cout<<"No"<<endl;

    }
}