import fcntl
import os
import select
import sys
import time
import termios
import tty

if not sys.stdin.isatty():
    raise RuntimeError('consoleio on non-tty')

fd = sys.stdin.fileno()
termstash = termios.tcgetattr(fd)
tty.setraw(fd)
flagstash = fcntl.fcntl(fd, fcntl.F_GETFL)
fcntl.fcntl(fd, fcntl.F_SETFL, flagstash | os.O_NONBLOCK)

score = 0
buf = b''

try:
    t0 = time.time()
    tend = t0 + 3
    sys.stdout.buffer.raw.write(b'Mash digits as fast as you can')
    while True:
        tnow = time.time()
        if tnow >= tend:
            break
        r, _, _ = select.select([sys.stdin.fileno()], [], [], tend - tnow)
        if r:
            ch = sys.stdin.buffer.raw.read(1)
            buf += ch
            score += sum(chr(c).isdigit() for c in ch)
finally:
    termios.tcsetattr(fd, termios.TCSANOW, termstash)
    fcntl.fcntl(fd, fcntl.F_SETFL, flagstash)

print('\nScore:', score)