#include<iostream>
#include<stdio.h>
#define MAXSIZE 100000
using namespace std;
void cmp(char s[],char t[]){
	int i=0,j=0,sum=0;
	while(s[i]!='\0'){
		while(t[j]!='\0'){
			if(s[i]==t[j]){
				j++;
				sum++;
				break;
			}
		j++;
		}
		i++;
	}
	if(sum==i) cout<<"Yes"<<endl;
	else cout<<"No"<<endl;
}
int main(){
	char s[MAXSIZE],t[MAXSIZE];
	while(scanf("%s %s",s,t)!=EOF){
	cmp(s,t);
	}
	return 0;
}