Merkkijono

import java.util.Scanner;

public class merkkijono {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		String jono = in.nextLine();
		in.close();

		int i = 0;
		while (i < jono.length()) {
			int j = i;
			while (j < jono.length() && jono.charAt(j) == jono.charAt(i)) {
				j++;
			}
			if (j - i > 1) {
				jono = jono.substring(0, i) + jono.substring(j);
				i = 0;
			} else {
				i++;
			}
		}
		System.out.println(jono);
	}
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED