// Base class
abstract class Bank {
    String name;
    String accountNumber;
    double balance;

    // Constructor to initialize customer details
    Bank(String name, String accountNumber, double balance) {
        this.name = name;
        this.accountNumber = accountNumber;
        this.balance = balance;
    }

    // Method to display customer details
    void displayDetails() {
        System.out.println("Customer Name: " + name);
        System.out.println("Account Number: " + accountNumber);
        System.out.println("Balance: " + balance);
    }

    // Abstract method to calculate rate of interest
    abstract void calculateInterest();
}

// Derived class for City Bank
class CityBank extends Bank {
    CityBank(String name, String accountNumber, double balance) {
        super(name, accountNumber, balance);
    }

    // Override to calculate interest for CityBank
    @Override
    void calculateInterest() {
        double interest = balance * 0.04; // 4% interest rate
        System.out.println("Interest earned from City Bank: " + interest);
    }
}

// Derived class for SBI Bank
class SBIBank extends Bank {
    SBIBank(String name, String accountNumber, double balance) {
        super(name, accountNumber, balance);
    }

    // Override to calculate interest for SBI Bank
    @Override
    void calculateInterest() {
        double interest = balance * 0.05; // 5% interest rate
        System.out.println("Interest earned from SBI Bank: " + interest);
    }
}

// Derived class for Canara Bank
class CanaraBank extends Bank {
    CanaraBank(String name, String accountNumber, double balance) {
        super(name, accountNumber, balance);
    }

    // Override to calculate interest for Canara Bank
    @Override
    void calculateInterest() {
        double interest = balance * 0.03; // 3% interest rate
        System.out.println("Interest earned from Canara Bank: " + interest);
    }
}

// Main class to test the program
public class six {
    public static void main(String[] args) {
        // Create objects for each bank
        Bank cityBankCustomer = new CityBank("Alice", "CB12345", 10000);
        Bank sbiBankCustomer = new SBIBank("Bob", "SBI54321", 15000);
        Bank canaraBankCustomer = new CanaraBank("Charlie", "CB67890", 20000);

        // Display customer details and calculate interest
        cityBankCustomer.displayDetails();
        cityBankCustomer.calculateInterest();

        System.out.println(); // Spacer

        sbiBankCustomer.displayDetails();
        sbiBankCustomer.calculateInterest();

        System.out.println(); // Spacer

        canaraBankCustomer.displayDetails();
        canaraBankCustomer.calculateInterest();
    }
}