import java.util.Scanner;

public class PasswordGen{
	public	static	void	main(String[] args){
		
		Scanner input = new Scanner(System.in);
		System.out.print("Please insert the size of your password.\n");
		int passlength = input.nextInt();
		password(passlength);
		
	}
	
	public	static	void	password(int num){
		int i;
		int[] password = new int[num];
		
		for(i = 0; i < num; i++){
			switch((int)(1 + (Math.random() * 3))){
				case 1:
					int offsetLarge = 'Z'-'A';
					int letterLarge = (int)('A' + (Math.random() * offsetLarge));
					password[i] = letterLarge;
					break;
				case 2:
					int offsetSmall = 'z'-'a';
					int letterSmall = (int)('a' + (Math.random() * offsetSmall));
					password[i] = letterSmall;
					break;
				case 3:
					int offsetNumber = '9'-'0';
					int number = (int)('0' + (Math.random() * offsetNumber));
					password[i] = number;
					break;
			}
		}
		System.out.print("Your password: ");
		for(i = 0; i < password.length; i++){
			System.out.print((char)password[i]);
		}
		System.out.print("\n");
	}
}