
    Develop a function that extracts the channel codes from a collection of transaction identifiers, where each code is represented by the last character of the transaction ID. The channel codes are critical for identifying potential fraud patterns across different banking channels like mobile, web, and ATM transactions.
    

    
def extract_rear(test_tuple):
    """
    Develop a function that extracts the channel codes from a collection of transaction identifiers, where each code is represented by the last character of the transaction ID. The channel codes are critical for identifying potential fraud patterns across different banking channels like mobile, web, and ATM transactions.
    

    """
def extract_rear(test_tuple):
    """
    Develop a function that extracts the channel codes from a collection of transaction identifiers, where each code is represented by the last character of the transaction ID. The channel codes are critical for identifying potential fraud patterns across different banking channels like mobile, web, and ATM transactions.
    

    """
    res = list((sub[len(sub) - 1] for sub in test_tuple))
    return res