Please solve the programming task below using a self-contained code snippet in a markdown code block.

There is a special keyboard with all keys in a single row.
Given a string keyboard of length 26 indicating the layout of the keyboard (indexed from 0 to 25). Initially, your finger is at index 0. To type a character, you have to move your finger to the index of the desired character. The time taken to move your finger from index i to index j is |i - j|.
You want to type a string word. Write a function to calculate how much time it takes to type it with one finger.
 
Please complete the following python code precisely:
```python
class Solution:
    def calculateTime(self, keyboard: str, word: str) -> int:
```