Naming Conventions

import java.util.Scanner;



public class Main {


    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String word = scanner.nextLine();

        if (word == word.toLowerCase()) {
            System.out.println("field");
        } else if (word == word.toUpperCase()) {
            System.out.println("constant");
        }else if(word.matches("[A-Z][a-z]+") ){
            System.out.println("pascal");
        }else if(word.matches(("[a-z]+[A-Z]+"))){
            System.out.println("elephant");
        }else{
            System.out.println("mismatch");
        }



        }
    }