import java.util.*;
import java.io.*;
public class Main {
    static PrintWriter pw  = new PrintWriter(new OutputStreamWriter(System.out));
     
    public static void main(String[] args) {
        MyScanner ms = new MyScanner();
        String T = ms.nextLine();
        String S = ms.nextLine();
        boolean game  = true;
        for(int i=0;i<T.length();i++){
            if(S.charAt(i)!=T.charAt(i))
            game = false;
        }
        pw.println(game?"Yes":"No");
        pw.flush();
    }
    public static class MyScanner {
        BufferedReader br;
        StringTokenizer st;
   
        public MyScanner() {
           br = new BufferedReader(new InputStreamReader(System.in));
        }
   
        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }
   
        int nextInt() {
            return Integer.parseInt(next());
        }
   
        long nextLong() {
            return Long.parseLong(next());
        }
   
        double nextDouble() {
            return Double.parseDouble(next());
        }
   
        String nextLine(){
            String str = "";
        try {
           str = br.readLine();
        } catch (IOException e) {
           e.printStackTrace();
        }
        return str;
        }
  
     }
} import java.util.*; util.* java import java.io.*; io.* java public class Main {
    static PrintWriter pw  = new PrintWriter(new OutputStreamWriter(System.out));
     
    public static void main(String[] args) {
        MyScanner ms = new MyScanner();
        String T = ms.nextLine();
        String S = ms.nextLine();
        boolean game  = true;
        for(int i=0;i<T.length();i++){
            if(S.charAt(i)!=T.charAt(i))
            game = false;
        }
        pw.println(game?"Yes":"No");
        pw.flush();
    }
    public static class MyScanner {
        BufferedReader br;
        StringTokenizer st;
   
        public MyScanner() {
           br = new BufferedReader(new InputStreamReader(System.in));
        }
   
        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }
   
        int nextInt() {
            return Integer.parseInt(next());
        }
   
        long nextLong() {
            return Long.parseLong(next());
        }
   
        double nextDouble() {
            return Double.parseDouble(next());
        }
   
        String nextLine(){
            String str = "";
        try {
           str = br.readLine();
        } catch (IOException e) {
           e.printStackTrace();
        }
        return str;
        }
  
     }
} Main static PrintWriter pw  = new PrintWriter(new OutputStreamWriter(System.out)); pw new PrintWriter(new OutputStreamWriter(System.out)) public static void main(String[] args) {
        MyScanner ms = new MyScanner();
        String T = ms.nextLine();
        String S = ms.nextLine();
        boolean game  = true;
        for(int i=0;i<T.length();i++){
            if(S.charAt(i)!=T.charAt(i))
            game = false;
        }
        pw.println(game?"Yes":"No");
        pw.flush();
    } main {
        MyScanner ms = new MyScanner();
        String T = ms.nextLine();
        String S = ms.nextLine();
        boolean game  = true;
        for(int i=0;i<T.length();i++){
            if(S.charAt(i)!=T.charAt(i))
            game = false;
        }
        pw.println(game?"Yes":"No");
        pw.flush();
    } MyScanner ms = new MyScanner(); ms new MyScanner() String T = ms.nextLine(); T ms.nextLine() ms.nextLine ms String S = ms.nextLine(); S ms.nextLine() ms.nextLine ms boolean game  = true; game true for(int i=0;i<T.length();i++){
            if(S.charAt(i)!=T.charAt(i))
            game = false;
        } int i=0; int i=0; i 0 i<T.length() i T.length() T.length T i++ i++ i {
            if(S.charAt(i)!=T.charAt(i))
            game = false;
        } {
            if(S.charAt(i)!=T.charAt(i))
            game = false;
        } if(S.charAt(i)!=T.charAt(i))
            game = false; S.charAt(i)!=T.charAt(i) S.charAt(i) S.charAt S i T.charAt(i) T.charAt T i game = false game false pw.println(game?"Yes":"No") pw.println pw game?"Yes":"No" game "Yes" "No" pw.flush() pw.flush pw String[] args args public static class MyScanner {
        BufferedReader br;
        StringTokenizer st;
   
        public MyScanner() {
           br = new BufferedReader(new InputStreamReader(System.in));
        }
   
        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }
   
        int nextInt() {
            return Integer.parseInt(next());
        }
   
        long nextLong() {
            return Long.parseLong(next());
        }
   
        double nextDouble() {
            return Double.parseDouble(next());
        }
   
        String nextLine(){
            String str = "";
        try {
           str = br.readLine();
        } catch (IOException e) {
           e.printStackTrace();
        }
        return str;
        }
  
     } MyScanner BufferedReader br; br StringTokenizer st; st public MyScanner() {
           br = new BufferedReader(new InputStreamReader(System.in));
        } MyScanner {
           br = new BufferedReader(new InputStreamReader(System.in));
        } br = new BufferedReader(new InputStreamReader(System.in)) br new BufferedReader(new InputStreamReader(System.in)) String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        } next {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        } while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } st == null || !st.hasMoreElements() st == null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } IOException e {
                    e.printStackTrace();
                } e.printStackTrace() e.printStackTrace e {
                    st = new StringTokenizer(br.readLine());
                } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st int nextInt() {
            return Integer.parseInt(next());
        } nextInt {
            return Integer.parseInt(next());
        } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next long nextLong() {
            return Long.parseLong(next());
        } nextLong {
            return Long.parseLong(next());
        } return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next double nextDouble() {
            return Double.parseDouble(next());
        } nextDouble {
            return Double.parseDouble(next());
        } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next String nextLine(){
            String str = "";
        try {
           str = br.readLine();
        } catch (IOException e) {
           e.printStackTrace();
        }
        return str;
        } nextLine {
            String str = "";
        try {
           str = br.readLine();
        } catch (IOException e) {
           e.printStackTrace();
        }
        return str;
        } String str = ""; str "" try {
           str = br.readLine();
        } catch (IOException e) {
           e.printStackTrace();
        } catch (IOException e) {
           e.printStackTrace();
        } IOException e {
           e.printStackTrace();
        } e.printStackTrace() e.printStackTrace e {
           str = br.readLine();
        } str = br.readLine() str br.readLine() br.readLine br return str; str public class Main {
    static PrintWriter pw  = new PrintWriter(new OutputStreamWriter(System.out));
     
    public static void main(String[] args) {
        MyScanner ms = new MyScanner();
        String T = ms.nextLine();
        String S = ms.nextLine();
        boolean game  = true;
        for(int i=0;i<T.length();i++){
            if(S.charAt(i)!=T.charAt(i))
            game = false;
        }
        pw.println(game?"Yes":"No");
        pw.flush();
    }
    public static class MyScanner {
        BufferedReader br;
        StringTokenizer st;
   
        public MyScanner() {
           br = new BufferedReader(new InputStreamReader(System.in));
        }
   
        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }
   
        int nextInt() {
            return Integer.parseInt(next());
        }
   
        long nextLong() {
            return Long.parseLong(next());
        }
   
        double nextDouble() {
            return Double.parseDouble(next());
        }
   
        String nextLine(){
            String str = "";
        try {
           str = br.readLine();
        } catch (IOException e) {
           e.printStackTrace();
        }
        return str;
        }
  
     }
} public class Main {
    static PrintWriter pw  = new PrintWriter(new OutputStreamWriter(System.out));
     
    public static void main(String[] args) {
        MyScanner ms = new MyScanner();
        String T = ms.nextLine();
        String S = ms.nextLine();
        boolean game  = true;
        for(int i=0;i<T.length();i++){
            if(S.charAt(i)!=T.charAt(i))
            game = false;
        }
        pw.println(game?"Yes":"No");
        pw.flush();
    }
    public static class MyScanner {
        BufferedReader br;
        StringTokenizer st;
   
        public MyScanner() {
           br = new BufferedReader(new InputStreamReader(System.in));
        }
   
        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }
   
        int nextInt() {
            return Integer.parseInt(next());
        }
   
        long nextLong() {
            return Long.parseLong(next());
        }
   
        double nextDouble() {
            return Double.parseDouble(next());
        }
   
        String nextLine(){
            String str = "";
        try {
           str = br.readLine();
        } catch (IOException e) {
           e.printStackTrace();
        }
        return str;
        }
  
     }
} Main
import java.util.*;
import java.io.*;
public class Main {
    static PrintWriter pw  = new PrintWriter(new OutputStreamWriter(System.out));
     
    public static void main(String[] args) {
        MyScanner ms = new MyScanner();
        String T = ms.nextLine();
        String S = ms.nextLine();
        boolean game  = true;
        for(int i=0;i<T.length();i++){
            if(S.charAt(i)!=T.charAt(i))
            game = false;
        }
        pw.println(game?"Yes":"No");
        pw.flush();
    }
    public static class MyScanner {
        BufferedReader br;
        StringTokenizer st;
   
        public MyScanner() {
           br = new BufferedReader(new InputStreamReader(System.in));
        }
   
        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }
   
        int nextInt() {
            return Integer.parseInt(next());
        }
   
        long nextLong() {
            return Long.parseLong(next());
        }
   
        double nextDouble() {
            return Double.parseDouble(next());
        }
   
        String nextLine(){
            String str = "";
        try {
           str = br.readLine();
        } catch (IOException e) {
           e.printStackTrace();
        }
        return str;
        }
  
     }
}