Detect parity error in any number of rows (after each row is entered)

Challenge Level: Growing experience

This programming challenge is linked to the following lessons:

Learning outcomes

Students will be able to:

Describe how variables store values and how they are used in your program.
Computer Science: Programming
Explain how to concatenate (join) strings of characters together.
Computer Science: Programming
Explain the difference between an if-else statement and an if statement and how you have used them in your program.
Computer Science: Programming
Explain what the modulo operator does in your program.
Computer Science: Programming

Requirement:

Write a program which asks the user to enter any number of rows and checks if there is a parity error in any of the rows after entering each row.

Your program should display the outputs shown in these panels for the given inputs provided:

Scratch

Click on the green flag, enter the inputs provided in the “testing examples” to see the expected output of your program.

Recommended blocks

Hints

Make a variable called “number of rows” and set its value to the input entered by the end user. Make a variable called “black cards total” and set its value to 0. Also make a string variable called “row” and set its value to the input entered by the end user. Check each letter of the string and if it’s ‘B’ add 1 to the “black cards total”. If the value of the “black cards total” is even (after checking every card in the row), display a message that the parity row is ok. If the value of the “black cards total” is odd, display a message that the row has a parity error. Repeat this “number of rows” times (for each row).
You can access a letter at the specified position in a string by using the block under “Operators”. For example:
In this challenge you need to access all the letters in user’s input (each row of the parity trick) and check to see how many of them are equal to B (black). Store the total number of black squares in a variable called “black cards total”.
You can find how many letters a string has by using the block unders “Operators”.
To find out if a number is even or odd, use the block (under "Operators") to find the remainder after dividing that number by two. If the remainder is zero the number is even. For example: