#include<iostream>
#include<algorithm>
#include<string>

using namespace std;

int main()
{
string str1, str2;
while (cin >> str1 >> str2)
{
	bool error;
	int mark = 0;
	for (int i = 0; i < str1.size(); i++)
	{
		error = 1;
		for (int j = mark; j < str2.size(); j++)
		{
			if (str1[i] == str2[j])
			{
				mark = j+1; error = false;  break;
			}

		}
		if (error) {
			cout << "No\n";
			break;
		}
	}
	if (!error) cout << "Yes\n";
}

	return 0;
}