What band is the highest and has a System of gsm-450?
CREATE TABLE table_77868 (
    "System" text,
    "Band" real,
    "Uplink (MHz)" text,
    "Downlink (MHz)" text,
    "Channel number" text
)
SELECT MAX("Band") FROM table_77868 WHERE "System" = 'gsm-450'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What band is the highest and has a System of gsm-450? ### Input: CREATE TABLE table_77868 (
    "System" text,
    "Band" real,
    "Uplink (MHz)" text,
    "Downlink (MHz)" text,
    "Channel number" text
) ### Response: SELECT MAX("Band") FROM table_77868 WHERE "System" = 'gsm-450'