import java.lang.System;
import java.applet.Applet;
import java.io.*;

/* takes stdin and outputs decoded od -X information */
public class Decode {

  public static void main(String[] args)
    throws java.io.IOException
    {
    int firstc=0;
    int state =0;
    int br;
    char ch;
    boolean done=false;
    int outind;
    byte b[];
    String s;
      b = new byte[1];

      while (!done) {
        br=System.in.read(b,0,1);
	if (br == -1)
	  done=true;
	else {
	  s = new String(b,0);
	  ch = s.charAt(0);
	  switch(state) {
            case 0:
              if (ch == ' ')
                state = 1;
              break;
            case 1:
              if (ch == '\n')
                state=0;
              else if ( ch == ' ')
                state=1; /* same state */
              else {
                firstc=Character.digit(ch,16);
		if (firstc == -1) {
		  System.err.println("Input Error on (first) Character: "+ch);
		  state=0;
		  }
		else
                  state=2;
                }
              break;
            case 2:
              if (ch == '\n' || ch == ' ') {
                System.err.println("Input Error (was looking for second char)...");
                state =0;
                }
              else {
		if (-1 == Character.digit(ch,16)) {
		  System.err.println("Input Error on Character (second char, not digit): "+ch);
		  state=0;
		  }
		else {
		  outind=firstc*16+Character.digit(ch,16);
		  /*System.out.print(list[outind]);*/
		  System.out.print((char)outind);
                  state=1;
		  }
                }
              break;
          } /* switch*/
       } /* else */
    } /* while*/
  System.out.flush();
    } /* main*/
} /* Decode */