
    Write a function that extracts the zone designation from each delivery route code in the fleet's route collection, where zone designations are represented by the last character of each route identifier. The extracted zone designations are essential for organizing deliveries and optimizing fleet distribution across different geographical areas.
    

    
def extract_rear(test_tuple):
    """
    Write a function that extracts the zone designation from each delivery route code in the fleet's route collection, where zone designations are represented by the last character of each route identifier. The extracted zone designations are essential for organizing deliveries and optimizing fleet distribution across different geographical areas.
    

    """
def extract_rear(test_tuple):
    """
    Write a function that extracts the zone designation from each delivery route code in the fleet's route collection, where zone designations are represented by the last character of each route identifier. The extracted zone designations are essential for organizing deliveries and optimizing fleet distribution across different geographical areas.
    

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