#include <stdio.h>
#include <string.h>
int main()
{
	char s[1000000];
	char ss[1000000];
	int i,j;
	while((scanf("%s",s)!=EOF)&&(scanf("%s",ss)!=EOF)){
		int count=0;
		int a=0;
		for(i=0;s[i]!='\0';i++){
			for(j=0;ss[j]!='\0';j++){
				if(s[i]==ss[j]){
					if(j>=a) {
						a=j;
						count++;
						break;
					}
				}
			}
		}
		if(count==strlen(s))
		  printf("Yes\n");
		else
		  printf("No\n");
	}
	return 0;
}