import java.util.Scanner;

public class RunLengthEncoding {

    public static void main(String[] args) {

        int counter = 1;
        String last = "";
        String output = "";
        String addToOutput = "";


        Scanner s = new Scanner(System.in);

        System.out.print("Enter input string: ");
        String inputstring = s.nextLine();


        System.out.print("Enter flag character: ");
        String inputflag = s.nextLine();
//      char inputflag = s.nextLine().charAt(0);
//      if(inputflag < '#' || (inputflag > '&' && inputflag != '*') || inputflag == '%'){
//          System.out.print("Bad Input.");
//          return;
        }
        try{
        if(inputstring != "#" || inputstring != "$" || inputstring != "&" || inputstring != "*"){
            throw new IllegalArgumentException("Bad Input.");


        }
        else{
            System.out.print(output);
        }

        for (int i = 0; i<inputstring.length(); i++){



                if((""+inputstring.charAt(i)).equals(last)){
                    counter ++;
        }
            else{
                if(counter>3)
                addToOutput = inputflag + last + counter;
                else{
                    addToOutput = "";
                    for(int j =0; j<counter; j++){
                        addToOutput = addToOutput + last;
                    }

                }
                output = output + addToOutput;
            counter = 1;

        }


        last = "" + inputstring.charAt(i);


                }


        catch(IllegalArgumentException e){
            System.out.println(e.getMessage());
        }

        }