问大佬们，为什么我的程序在input的时候turtle界面会无响应？

import turtle
import random
import time
t = turtle.Turtle()

t.ht()

def pixel(x,y,c,forward=100):
    t.color(c)
    t.penup()
    t.goto(x, y)
    t.pendown()
    t.begin_fill()
    for i in range(4):
        t.forward(forward)
        t.left(90)
    t.end_fill()

turtle.tracer(False)
pixel(-50,-50,"pink")
pixel(-150,-50,"green")
pixel(50,-50,"blue")
pixel(-50,50,"yellow")
pixel(-50,-150,"red")
pixel(-150,50,"purple")
pixel(-150,-150,"grey")
pixel(50,50,"orange")
pixel(50,-150,"brown")
turtle.tracer(True)

t1=turtle.Turtle()
t1.shape("turtle")

def tur(a):
    t1.penup()
    t.ht()
    if a == 1:
        t1.goto(-100,100)
    elif a==2:
        t1.goto(0,100)
    elif a==3:
        t1.goto(100,100)
    elif a==4:
        t1.goto(-100,0)
    elif a == 5:
        t1.goto(0,0)
    elif a==6:
        t1.goto(100,0)
    elif a==7:
        t1.goto(-100,-100)
    elif a==8:
        t1.goto(0,-100)
    elif a==9:
        t1.goto(100,-100)
    else:
        print("你是怎么做到的？")
        exit(0)
    t1.pendown()
    t1.showturtle()
    time.sleep(1)
    t1.ht()

t2 = turtle.Turtle()
t2.speed(0)
t2.color("violet")
t2.ht()

while True:
    s=""
    for x in range(4):
        area = random.randint(1,9)
        #print(area)
        tur(area)
        s += str(area)

    a=input("请输入海龟的出现顺序:")

    if a == s:
        t2.penup()
        t2.goto(-30,-200)
        t2.pendown()
        t2.write("回答正确！",font=("行楷",20))
        break

    else:
        t2.penup()
        t2.goto(-100,-200)
        t2.pendown()
        t2.write("回答错误 请再试一次",font=("行楷",20))
        time.sleep(3)
        t2.clear()

turtle.done()