def invert_dictionary(original_dict):
    """
    Inverts a dictionary where values become keys and keys become values.
    Handles cases where multiple original keys map to the same value by
    making the new value a list of original keys.
    """
    inverted_dict = {}
    for key, value in original_dict.items():
        if value not in inverted_dict:
            inverted_dict[value] = [key]
        else:
            inverted_dict[value].append(key)
    return inverted_dict

# Example Usage:
grades = {
    "Alice": "A",
    "Bob": "B",
    "Charlie": "A",
    "David": "C",
    "Eve": "B"
}

inverted_grades = invert_dictionary(grades);
print(f"Original dictionary: {grades}")
print(f"Inverted dictionary: {inverted_grades}")

# Another example without duplicate values
settings = {
    "theme": "dark",
    "language": "en",
    "notifications": "on"
}

inverted_settings = invert_dictionary(settings);
print(f"
Original dictionary: {settings}")
print(f"Inverted dictionary: {inverted_settings}")