+ 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
```
7
```
Micromasters Certificates