#include<iostream>

 #include<string>

 #include<vector>

 #include<cstring>

 using namespace std;

 int main()

 {

     string s1, s2;

     while(cin >> s1 >> s2)

     {

         int i = , j = , tot = ;

         for(; i < s1.size() && j < s2.size();)

         {

             if(s1[i] == s2[j])

             {

                 tot++;

                 i++;

                 j++;

             }

             else j++;

         }

         if(tot == s1.size())cout<<"Yes"<<endl;

         else cout<<"No"<<endl;

     }

     return ;

 }