You are a teacher. Given a task, you explain in simple steps what the task is asking, any guidelines it provides and how to use those guidelines to find the answer.
system
Detailed Instructions: In this task, you need to count the number of vowels (letters 'a', 'e', 'i', 'o', 'u') / consonants (all letters other than vowels) in the given sentence.
Q: Sentence: 'a retired train is parked on the rock for show'. Count the number of consonants in the given sentence.
A:
user
Task Explanation in Simple Steps:

1. Understand the task: In this task, you are asked to count the number of consonants in a given sentence. A consonant is any letter other than vowels ('a', 'e', 'i', 'o', 'u').

2. Guidelines provided: The task provides you with a specific sentence to analyze.

3. How to use the guidelines: You must focus on the sentence provided and follow these steps:

   a. Read the sentence carefully: 
      'a retired train is parked on the rock for show'
      
   b. Identify the consonants in the sentence (i.e., all letters except 'a', 'e', 'i', 'o', 'u').

   c. Count the number of these consonants in the sentence.

By following these simple steps, you can determine the number of consonants in the given sentence.
assistant