import java.util.StringJoiner;
import java.lang.String;


public class My {
    public static void main(String[] args) {

        String[] arr = new String[]{"i", "am", "super", "HERO"};
        StringJoiner sj = new StringJoiner(" ");
        //StringBuffer sb = new StringBuffer(".");
        for (String s : arr) {
            sj.add(s);
        }
        sj.append(".");
        sj.capitalize();
        System.out.println(sj);
    }

import java.util.StringJoiner;
import java.lang.String;


public class My {
    public static void main(String[] args) {

        String[] arr = new String[]{"i", "am", "super", "HERO"};
        StringJoiner sj = new StringJoiner(" ");
        //StringBuffer sb = new StringBuffer(".");
        for (String s : arr) {
            sj.add(s);
        }
        sj.append(".");
        sj.capitalize();
        System.out.println(sj);
    }