CREATE TABLE table_11900773_5 (first_day_cover_cancellation VARCHAR2, theme VARCHAR2)

What was the first day cover cancellation for the University of Saskatchewan themed stamp?
SELECT first_day_cover_cancellation FROM table_11900773_5 WHERE theme = "University of Saskatchewan"
SELECT "first_day_cover_cancellation" FROM "table_11900773_5" WHERE "University of Saskatchewan" = "theme"