#include<iostream>
#include<cstring>
using namespace std;
int main ()
{
	char s[100002],sub[100002];
	while(scanf("%s%s",sub,s)!=EOF)
	{
		int l_s,l_sub;
		l_sub=strlen(sub);
		l_s=strlen(s);
		int pre=-1;
		int sum=0;
		for(int i=0;i<l_sub;i++)
			for(int j=pre+1;j<l_s;j++)
				if(sub[i]==s[j]){pre=j;sum++;break;}
		if(sum==l_sub)cout<<"Yes"<<endl;
		else cout<<"No"<<endl;
	}
}