Pakkaus

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 */
//package datatahti1;

import java.util.*;

/**
 *
 * @author ACER
 */
public class Datatahti1 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String merkkijono = input.nextLine();
        //String vastaus = "";
        kvn kjn = kvn.emt;
        long numero = 1;
        String vms = "";

        for (char merkki : merkkijono.toCharArray()) {

            if (Character.isDigit(merkki)) {

                if (kjn == kvn.kirjain) {

                    luuppi(vms, numero);
                    vms = "";

                }
                kjn = kvn.numero;
                vms += merkki;
            }
            if (Character.isLetter(merkki)) {

                if (kjn == kvn.numero) {

                    numero = Integer.parseInt(vms);
                    vms = "";

                }
                kjn = kvn.kirjain;
                vms += merkki;

            }

        }
        if (kjn == kvn.kirjain) {

            luuppi(vms, numero);

        }
        System.out.println();
    }

    private enum kvn {

        numero, kirjain, emt
    }

    private static void luuppi(String merkit, long toistot) {
        //String vv = "";
        for (int i = 0; i < toistot; i++) {

            System.out.print(merkit);

        }
    }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED