#include<bits/stdc++.h>
using namespace std;
const int N=100010;
string s1,s2;
int main()
{
	while(cin>>s1>>s2)
	{
		int n=s1.size();
		int m=s2.size();
		int i=0,j=0,cnt=0;
		while(i<n&&j<m)
		{
			if(s1[i]==s2[j])
			{
				i++;
				j++;
				cnt++;
			}
			else
			{
				j++;
			}
		} 
		if(cnt==n) cout<<"Yes"<<endl;
		else cout<<"No"<<endl; 
	}
	
	return 0;
}