What is the name of the person in the First UK Tour Cast for the Character of Sister Mary Robert?
CREATE TABLE table_15520 (
    "Character" text,
    "Original West End Cast" text,
    "Original Broadway Cast" text,
    "First UK Tour Cast" text,
    "First US Tour Cast" text
)
SELECT "First UK Tour Cast" FROM table_15520 WHERE "Character" = 'sister mary robert'
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 is the name of the person in the First UK Tour Cast for the Character of Sister Mary Robert? ### Input: CREATE TABLE table_15520 (
    "Character" text,
    "Original West End Cast" text,
    "Original Broadway Cast" text,
    "First UK Tour Cast" text,
    "First US Tour Cast" text
) ### Response: SELECT "First UK Tour Cast" FROM table_15520 WHERE "Character" = 'sister mary robert'