CREATE TABLE table_47838 ("Tie no" TEXT, "Home team" TEXT, "Score" TEXT, "Away team" TEXT, "Date" TEXT)

What is the tie number in the game on 5 January 1986 where Exeter City is the away team?
SELECT "Tie no" FROM table_47838 WHERE "Date" = '5 january 1986' AND "Away team" = 'exeter city'
SELECT "Tie no" FROM "table_47838" WHERE "Away team" = 'exeter city' AND "Date" = '5 january 1986'