import java.io.*;


public class read {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
		// TODO Auto-generated method stub
		byte[] b=new byte[2];
		try{
		System.in.read(b);
	
		StringBuffer s=new StringBuffer("");
		for(int i=0;i<b.length;i++){
			s.append(Character.toChars(b[i]));
		}
		System.out.println(s.toString());
		

		}
		catch(Exception e){
			e.printStackTrace();
		}
		
	
	
	}

}