
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();
        String actualString = T.substring(0,T.length()-1);
        if(S.equals(actualString)){
            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();
        String actualString = T.substring(0,T.length()-1);
        if(S.equals(actualString)){
            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();
        String actualString = T.substring(0,T.length()-1);
        if(S.equals(actualString)){
            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();
        String actualString = T.substring(0,T.length()-1);
        if(S.equals(actualString)){
            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 String actualString = T.substring(0,T.length()-1); actualString T.substring(0,T.length()-1) T.substring T 0 T.length()-1 T.length() T.length T 1 if(S.equals(actualString)){
            System.out.println("Yes");
        }
        else{
            System.out.println("No");
        } S.equals(actualString) S.equals S actualString {
            System.out.println("Yes");
        } System.out.println("Yes") System.out.println System.out System System.out "Yes" {
            System.out.println("No");
        } 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();
        String actualString = T.substring(0,T.length()-1);
        if(S.equals(actualString)){
            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();
        String actualString = T.substring(0,T.length()-1);
        if(S.equals(actualString)){
            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();
        String actualString = T.substring(0,T.length()-1);
        if(S.equals(actualString)){
            System.out.println("Yes");
        }
        else{
            System.out.println("No");
        }
    }
}
