import java.util.*;
import java.io.*;
/**
* Created by rajat goyal on 1/12/2017.
*/
public class AppendAndDelete {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
char s[] = in.next().toCharArray();
int s1 = s.length;
char t[] = in.next().toCharArray();
int t1 = t.length;
int k = in.nextInt();
int contM = 0;
for(int i=0;i(s1+t1))
ans = "Yes";
System.out.println(ans);
}
}