//acm 1936
//All in All
#include <iostream>
using namespace std;
#include <string>

int main()
{
	string s , t;
	cin>>s>>t;
	while(cin)
	{
		int number = 0;
		int k=0;
		for(int j=0;j<s.size();j++)
		{
			for(;k<t.size();k++)
			{
				if(s.at(j)==t.at(k))
				{
					number++;
					break;
				}
			}
		}
		if(number == s.size() && s.size() <= t.size())
			cout<<"Yes"<<endl;
		else
			cout<<"No"<<endl;
		cin>>s>>t;
	}
		return 0;
}