#include<cstdio>
using namespace std;
char fir[100001],sec[100001];
int fi,si;
int main()
{
	while(scanf("%s%s",fir,sec)==2)
	{
		fi=0,si=0;
		while(sec[si] && fir[fi]){
			if(fir[fi]==sec[si])	++fi,++si;
			else ++si;
		}
		if(fir[fi]==0)	printf("Yes\n");
		else printf("No\n");
	}
	return 0;	
}