void setup() {
  // put your setup code here, to run once:
 pinMode(9, OUTPUT);
 pinMode(4, OUTPUT);
 pinMode(2, INPUT);
}
int state;
void loop() {
  // put your main code here, to run repeatedly:
state=digitalRead(2);
delay(1000);
if(state==1){
  digitalWrite(9, HIGH);
  digitalWrite(4, LOW);
}
else{
  digitalWrite(9, LOW);
  digitalWrite(4, HIGH);
}
}