from machine import Pin
import time, random

green = Pin(1, Pin.OUT)
red = Pin(2, Pin.OUT)

while True:
    a = random.randint(0,10)
    b = random.choice(['+', '-'])
    c = random.randint(0,10)
    equation = f'{a} {b} {c} = '
    temp = input(equation)
    ans = eval(str(a) + b + str(c))
    if int(temp) == ans:
        print('정답입니다!')
        green.value(1)
        time.sleep(3)
        green.value(0)
    else:
        print(f'오답입니다. 정답은 {ans} 입니다.')
        red.value(1)
        time.sleep(3)
        red.value(0)