Develop an algorithm, using either pseudo-code or a flowchart, that:

• initialises a variable called activeSensor to False
• sets the variable activeSensor to True if the string contained in the variable sensorID is exactly 3 characters in length, begins with a lowercase 'w', has a lowercase 's' as its second character, and has a single numeric digit as its third character

Examples:

• If the value of sensorID is "ws0" or "ws7", then activeSensor should be True
• If the value of sensorID is "Ws7", "ws", "ws7a", or "ws78", then activeSensor should be False

You may wish to use the following in your answer:

• The subroutine isDigit(ch) which returns True if the character ch is a digit (e.g., "0" to "9") and False otherwise.
• The function length(string) which returns the number of characters in a string.