Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| No. | Train No: | Origin | Destination | Train Name |
| --- | --- | --- | --- | --- |
| 1. | 56654 | Mangalore Central | Kozhikode | Passenger |
| 2. | 56324 | Mangalore Central | Coimbatore city Junction | Fast Passenger |
| 3. | 56656 | Mangalore Central | Kannur | Passenger |
| 4. | 56643/56645 | Mangalore Central | Kabakaputtur | Passenger |
| 5. | 56640 | Mangalore Central | Verna | Passenger |
| 6. | 56647 | Mangalore Central | Subrahmanya Road | Passenger |
| 7. | 56661 | Mangalore Central | Cheruvathur | Passenger |
| 8. | 70106 | Mangalore Central | Bhatkal | DEMU |
Question:
how many trains are demu category?
Answer:
1