import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String []args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        String t = br.readLine();
        t=t.substring(0,t.length()-1);
        if(s.equals(t))
            System.out.println("Yes");
        else
            System.out.println("No");
    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io public class Main {
    public static void main(String []args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        String t = br.readLine();
        t=t.substring(0,t.length()-1);
        if(s.equals(t))
            System.out.println("Yes");
        else
            System.out.println("No");
    }
} Main public static void main(String []args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        String t = br.readLine();
        t=t.substring(0,t.length()-1);
        if(s.equals(t))
            System.out.println("Yes");
        else
            System.out.println("No");
    } main {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        String t = br.readLine();
        t=t.substring(0,t.length()-1);
        if(s.equals(t))
            System.out.println("Yes");
        else
            System.out.println("No");
    } BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) String s = br.readLine(); s br.readLine() br.readLine br String t = br.readLine(); t br.readLine() br.readLine br t=t.substring(0,t.length()-1) t t.substring(0,t.length()-1) t.substring t 0 t.length()-1 t.length() t.length t 1 if(s.equals(t))
            System.out.println("Yes");
        else
            System.out.println("No"); s.equals(t) s.equals s t System.out.println("Yes") System.out.println System.out System System.out "Yes" System.out.println("No") System.out.println System.out System System.out "No" String []args args public class Main {
    public static void main(String []args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        String t = br.readLine();
        t=t.substring(0,t.length()-1);
        if(s.equals(t))
            System.out.println("Yes");
        else
            System.out.println("No");
    }
} public class Main {
    public static void main(String []args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        String t = br.readLine();
        t=t.substring(0,t.length()-1);
        if(s.equals(t))
            System.out.println("Yes");
        else
            System.out.println("No");
    }
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String []args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        String t = br.readLine();
        t=t.substring(0,t.length()-1);
        if(s.equals(t))
            System.out.println("Yes");
        else
            System.out.println("No");
    }
}
