# Imports go at the top
from microbit import *
import time

# wait for button A. Start of race
while button_a.is_pressed()==False:
    time.sleep(0.01)

t = 0
display.show("X")
# Run race waiting for B
while button_b.is_pressed()==False:
    time.sleep(0.01)
    t+= 1
# pause after race
display.clear()
time.sleep(2)

# display time:   
while True:
    display.show(int(t/100))
    time.sleep(1)
    display.show(".")
    time.sleep(1)
    display.show(int(t/10)%10)
    time.sleep(1)
    display.show(t%10)
    time.sleep(1)
    display.clear()
    time.sleep(3)