华为OD机考-英文输入法-逻辑分析（JAVA 2025B卷）

import java.util.*;

public class EnglishSpell {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while(sc.hasNextLine()){
            String line = sc.nextLine();
            // don't-> don t
            if(line.contains("'")){
                line  = line.replace("'", " ");
            }
            String[] source = line.split("\\s+");
            String target = sc.nextLine();
            test(source,target);
        }
    }

    private static void test(String[] source,String target){
        HashSet<String> set = new HashSet<>();
        for(String s:source){
            // delete comma and dot
            if(!Character.isLetter(s.charAt(s.length()-1))){
                set.add(s.substring(0,s.length()-1));
            }else{
                set.add(s);
            }
        }
        List<String> sb = new ArrayList<>();
        for(String s:set){
            // find target word
            if(s.startsWith(target)){
                sb.add(s);
            }
        }
        if(sb.isEmpty()){
            System.out.println(target);
            return;
        }
        sb.sort(String::compareTo);
        for(int i=0;i<sb.size();i++){
            System.out.print(sb.get(i));
            if(i!=sb.size()-1){
                System.out.print(" ");
            }
        }
    }
}