import java.util.Scanner;
public class Main
{
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		String s = input.nextLine();
		
		char[] words = new char[6];
		for (int i=0;i<6;i++)
		{
			words[i] = s.charAt(i);
		}

		if (
			words[2]==words[3]&&
			words[4]==words[5]&&
			words[0]!=words[2]&&
			words[0]!=words[4]&&
			words[1]!=words[2]&&
			words[1]!=words[4]&&
			words[0]!=words[1]
			)
			System.out.println("Yes");
		else
			System.out.println("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