int led=6;
void setup() {
  // put your setup code here, to run once:
pinMode(led, INPUT);
pinMode(A0, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
int a=analogRead(A0);
digitalWrite(led,HIGH);
delay(1023-a);
digitalWrite(led,LOW);
delay(1023-a);
}