CREATE TABLE table_55526 ("Team 1" TEXT, "Agg." TEXT, "Team 2" TEXT, "1st leg" TEXT, "2nd leg" TEXT)

What is the team 2 for team 1 of Valletta?
SELECT "Team 2" FROM table_55526 WHERE "Team 1" = 'valletta'
SELECT "Team 2" FROM "table_55526" WHERE "Team 1" = 'valletta'