''' Purpose: prints a user-specified countdown followed by 'Blast off!'
'''


### get countdown range
reply = input( "Enter starting and ending numbers for the countdown: " )

print()

### convert input to ints
high, low = reply.split()
high, low = int( high ), int( low )

### print off the range
for i in range( ... ) :
    ...

### print ending phrase
print( "Blast off!" )