高橋くんと文字列圧縮(http://abc019.contest.atcoder.jp/tasks/abc019_2)

abc-019.java

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
public class Main {
 
    private static final Pattern pattern = Pattern.compile("([a-z])\\1*");
 
    public static void main(String[] args) {
 
        Scanner sc = new Scanner(System.in);
        String org = sc.next();
 
        Matcher matcher = pattern.matcher(org);
 
        while(matcher.find()){
            String matched = matcher.group();
            System.out.print(matched.charAt(0) + "" + matched.length());
        }
 
        System.out.println();
    }
 
}