Micro: bit Fundamental Course--Button&Display

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In our last blog  Start Your Micro:bit Programming Trip we have talked about the basic operation method of Microsoft Makecode. In the following articles, we will teach you some fundamental functions of blocks one by one .
Our purpose:
To know basic usage of Makecode through studying buttons and blocks.
Materials we need:
Micro:bit×1
USB Cable×1
On Micro:bit, there are 5*5 LED metric dot display and 2 buttons. And today we are going to learn how to use button and LED display together.
Our requirement:
Press down a button to display its relative direction. Press 2 buttons together for clearing the display.
Procedure:
Step 1:
Drag out block "on button pressed" from Input column and set the button to be "A".
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Under block "on button A pressed", we insert block "show arrow", which can make micro:bit to display directions with arrow. And here we set direction to be "west".
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Step 2:
Choose block "on button pressed", cope and paste it. Then set button to be "B" and direction to be "East".
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Step 3:
Drag out block "on button pressed" from Input column again and set the button to be "A+B".
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Insert "clear screen" into this block.
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Step 4:
In the left analog window, we can check analog operation. Click Virtual button on Micro:bot to check our program.
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Step 5:
After confirmation, download program into Micro:bit.

Question:
If we want to use character string to display "west" and "east", then how to revise our program?

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