CREATE TABLE table_79359 ("Tie no" TEXT, "Home team" TEXT, "Score" TEXT, "Away team" TEXT, "Date" TEXT)

What is the tie no for the away team altrincham?
SELECT "Tie no" FROM table_79359 WHERE "Away team" = 'altrincham'
SELECT "Tie no" FROM "table_79359" WHERE "Away team" = 'altrincham'