+ محدودیت زمان: ۱ ثانیه + محدودیت حافظه: ۲۵۶ مگابایت ---------- The Department of Computer Engineering has provided several micromasters, each containing a curriculum. If a student successfully completes all the courses of a micromaster, he will receive the certificate of that micromaster. A course may be included in the curriculum of several micromasters. Soroush, who only thinks about getting a certificate and doesn’t care about the type of certificate, wants to get $3$ micromasters certificates by taking the minimum possible number of courses. The micromasters curriculums are posted on the bulletin board. Help Soroush reach his goal according to the micromasters curriculums. # ورودی The input represents a bulletin board. The board consists of at most $400$ rows and $400$ columns. Each micromasters curriculum is encapsulated in a rectangular box. The boundaries of the bulletin board and the curriculum boxes are represented by characters `“+”`, `“-”`, and `“|”` for corners, horizontal sides, and vertical sides, respectively. The curriculum boxes are disjoint (with no characters in common) and each has its own boundary. Each line inside a curriculum box contains at most one course name. Course names consist of alphanumeric and space characters. Course names are not case-sensitive, and spaces do not matter in them. For example, **“General math1”** and **“generalMath 1”** are the same. There are at most $50$ curriculum boxes and each box contains at most $30$ courses. It is guaranteed that there are at least $3$ boxes on the board and there is at least $1$ course in each box. # خروجی Print a single line containing the minimum number of courses that should be taken by Soroush to get at least 3 certificates. # مثال ### ورودی نمونه ۱ ``` +-------------------------------------------------+ | +-------------------+ | | |Algorithm Design | +-------------------+ | | | Programming | |PROGRAMMING | | | |Discrete Structures| | Web Prgramming | | | | Data Structures | | | | | +-------------------+ | DatabaseDesign | | | |Software Test | | | +--------------+ | Patterns | | | | Python | +-------------------+ | | +--------------+ | | +------------------------+ | | |Programming | | | | AI | | | | Algorithm design| | | |Database Design | | | +------------------------+ | +-------------------------------------------------+ ``` ### خروجی نمونه ۱ ``` 8 ```