题解 | #数据分类处理#

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int ic = in.nextInt();
        String[] ii = new String[ic];
        for (int i = 0; i < ic; i++) {
            ii[i] = String.valueOf(in.nextInt());
        }
        int rc = in.nextInt();
        TreeSet<Integer> set = new TreeSet<>();
        for (int i = 0; i < rc; i++) {
            set.add(in.nextInt());
        }
        Iterator<Integer> iterator = set.iterator();
        ArrayList<Integer> result = new ArrayList<>();
        while (iterator.hasNext()) {
            Integer next = iterator.next();
            ArrayList<Integer> contain = new ArrayList<>();
            for (int j = 0; j < ii.length; j++) {
                if (ii[j].contains(next + "")) {
                    contain.add(j);
                }
            }
            if (contain.size() > 0) {
                result.add(next);
            } else {
                continue;
            }
            result.add(contain.size());
            for (Integer integer : contain) {
                result.add(integer);
                result.add(Integer.valueOf(ii[integer]));
            }
        }
        System.out.print(result.size() + " ");
        for (Integer integer : result) {
            System.out.print(integer + " ");
        }
    }
}