import java.io.*;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    
    String[] names = br.readLine().split(" ");
    Set<String> nameSet = new HashSet<String>(Arrays.asList(names));
    System.out.println(nameSet.size() == 2 ? "Yes" : "No");
    
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz