11. 문자열 압축

import java.util.*;

class Main {
	public String solution(String s) {

		String answer = "";
		s = s + " ";
		int cnt = 1;
		for (int i = 0; i < s.length() - 1; i++) {
			if (s.charAt(i) == s.charAt(i + 1))
				cnt++;
			else {
				answer += s.charAt(i);
				if (cnt > 1)
					answer += String.valueOf(cnt);
				cnt = 1;
			}
		}
		return answer;
	}

	public static void main(String[] args) {
		Main T = new Main();
		Scanner kb = new Scanner(System.in);
		System.out.print(T.solution(kb.next()));

	}
}