content: import java.io.*;
  import java.math.*;
  import java.security.*;
  import java.text.*;
  import java.util.*;
  import java.util.concurrent.*;
  import java.util.regex.*;
  
  public class solution {
  
      // Complete the appendAndDelete function below.
      static String appendAndDelete(String s, String t, int k) {
          int commonLength = 0;
  
          for (int i = 0; i < java.lang.Math.min(s.length(), t.length()); i++) {
              if (s.charAt(i) == t.charAt(i))
                  commonLength++;
              else
                  break;
          }
          // need a bigger k to transform s to t or vice versa
          if ((s.length() + t.length() - 2 * commonLength) > k) {
              return "No";
          }
          // we have exactly k moves so if k is odd number of distinct digits should be
          // odd too
          else if ((s.length() + t.length() - 2 * commonLength) % 2 == k % 2) {
              return "Yes";
          }
          // deletion of any one string and addition of characters of other string
          else if ((s.length() + t.length() - k) < 0) {
              return "Yes";
          }
  
          else {
              return "No";
          }
  
      }
  
      private static final Scanner scanner = new Scanner(System.in);
  
      public static void main(String[] args) throws IOException {
          BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
  
          String s = scanner.nextLine();
  
          String t = scanner.nextLine();
  
          int k = scanner.nextInt();
          scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
  
          String result = appendAndDelete(s, t, k);
  
          bufferedWriter.write(result);
          bufferedWriter.newLine();
  
          bufferedWriter.close();
  
          scanner.close();
      }
  }
  