210223_3.txt

//15회 E-PPER 5번 문자열 압축
import java.io.*;
import java.util.*;
//프로그래머스에서는 main함수 및 입출력문이 필요하지 않습니다. 대신 solution함수만 작성하면 됩니다.
public class Main {
	static String solution(String input){
		String answer="";
		String str[] = {"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"};
		ArrayList<Integer> list = new ArrayList<Integer>();
		ArrayList<String> list2 = new ArrayList<String>();
		for(int i=0; i<input.length(); i++){
			if(input.charAt(i)=='0'){
				list.add(0);
			}else{
				list.add(1);
			}
		}
		int count=1;
		for(int i=0; i<list.size(); i++){
			if(i!=0&&list.get(i)==list.get(i-1)){
				count++;
			}else if(i!=0&&list.get(i)!=list.get(i-1)){
				list2.add(str[count-1]);
				count=1;
			}
		}
		list2.add(str[count-1]);
		if(input.charAt(0)=='1')
			answer+="1";
		for(int i=0; i<list2.size(); i++)
			answer+=list2.get(i);
		return answer;
	}
	
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String input = br.readLine();
		
		String answer= solution(input);
		
		System.out.println(answer);
	}
}