const int led=2;
const int led1=3;
const int push=7;

void setup() 
{
  pinMode(led, OUTPUT);
  pinMode(led1,OUTPUT);
  pinMode(push, INPUT_PULLUP);
}

void loop() 
{
  if(digitalRead(push)==LOW)
  {
  digitalWrite(led,HIGH);
  digitalWrite(led1,LOW);
  }
  else
  {
  digitalWrite(led,LOW);
  digitalWrite(led1,HIGH);
  }
}