Ромб

import java.util.Scanner;
import java.util.ArrayList;

public class untitled {
    public static void main (String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Введите число и символ: ");
        ArrayList<String> tmpAllM = new ArrayList<>();
        String symbol = in.nextLine();
        tmpAllM = numberLiter(symbol);
        int number = Integer.parseInt(tmpAllM.get(0));
        String liter = tmpAllM.get(1);
        int length = (2*number+1);
        int middle = (length - 1)/2;
        int end = length - 1;
        for(int i = 0; i<length;i++){
            System.out.println();
            System.out.print(liter);
            for (int j = 0; j<length-2;j++) {
                if (i == 0) {
                    System.out.print(liter);
                }
                if (i == end ) {
                    System.out.print(liter);
                }
                if (i == middle) {
                    System.out.print(liter);
                }
                if (i != middle &&  i !=end && i!=0){
                    for (int g = 1; g <(number-1)*2; g=g+2) {
                        for(int f = 0; f < ((number-1)*2)-g; f++) {
                            System.out.print(".");
                        }
                        for(int f = 0; f < 1*g; f++){
                            System.out.print(liter);
                        }
                    }
                }
            }
            System.out.print(liter);
        }
        System.out.println();


    }
    public static ArrayList<String> numberLiter (String str){
        ArrayList<String> tmpM = new ArrayList<>();
        for(String s: str.split("")){
            tmpM.add(s);
        }
        return tmpM;
    }
}