import java.security.*;
import java.util.*;
public class MD5Katse{
  public static void main(String[] arg) throws Exception{
    MessageDigest md=MessageDigest.getInstance("MD5");
    String tekst="aaa";
    byte[] lyhend=md.digest(tekst.getBytes());
    StringBuffer tulemus=new StringBuffer();
    for(int i=0; i<lyhend.length; i++){
      String abi=Integer.toHexString(lyhend[i] & 0xff);
      if(abi.length()<2){abi="0"+abi;}
      tulemus.append(abi);
    }
    System.out.println(tulemus);
  }
}