#!/usr/bin/env python3

iban_lengths = {
    'AT': 20,  # Austria
    'DE': 22,  # Germany
    'CH': 21,  # Switzerland
}

# Check the length of the IBAN
def check_iban_length(iban):
    country_code = iban[:2]
    if country_code not in iban_lengths:
        print('Country code not found')
        return False
    elif len(iban) != iban_lengths[country_code]:
        print('IBAN length is incorrect')
        return False
    else:
        return True

# Verify the IBAN; add checksum verification later
def validate_iban(iban):
    return check_iban_length(iban) 

# Main code starts here
iban = 'AT4832000000123458642'
if validate_iban(iban):
    print('Valid IBAN')