void setup() {
 // put your setup code here, to run once:
pinMode(9,OUTPUT);
pinMode(10,OUTPUT);
pinMode(11,OUTPUT);
}
void loop() {
 // put your main code here, to run repeatedly:
digitalWrite (9,HIGH);
digitalWrite (11,LOW);
delay(1000);
digitalWrite (10,HIGH);
digitalWrite (9,LOW);
delay(1000);
digitalWrite (11,HIGH);
digitalWrite (10,LOW);
delay(1000);
}