#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
char s[100005],t[100005];
int main(){
    while(scanf("%s%s",s,t)==2){
        int i,j,lens = strlen(s),lent = strlen(t);
        for(i=0,j=0;i<lens&&j<lent;){
            if(s[i]==t[j]){
                i++;j++;
            }
            else{
                j++;
            }
        }
        if(i==lens)    printf("Yes\n");
        else        printf("No\n");
    }
    return 0;
}