
    Write a function that extracts the unit code (last character) from each patient record identifier to analyze patient readmission patterns across hospital departments. The function should process a tuple of medical record identifiers where each identifier ends with a single-character unit code, and return only these unit codes while maintaining their sequence.
    

    
def extract_rear(test_tuple):
    """
    Write a function that extracts the unit code (last character) from each patient record identifier to analyze patient readmission patterns across hospital departments. The function should process a tuple of medical record identifiers where each identifier ends with a single-character unit code, and return only these unit codes while maintaining their sequence.
    

    """
def extract_rear(test_tuple):
    """
    Write a function that extracts the unit code (last character) from each patient record identifier to analyze patient readmission patterns across hospital departments. The function should process a tuple of medical record identifiers where each identifier ends with a single-character unit code, and return only these unit codes while maintaining their sequence.
    

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