The Street

The String street is known as the busiest street in Codeland. Tourists from all over the world want to visit the street once they are in Codeland. The Chef owns N souvenir stores across the street (numbered from 1 to N). At the beginning there is no souvenir in any store, the Chef has some plans to add some new items. Each the Chef's plan is represented by 4 numbers: u v a b which mean an items wi