void setup() {
  // put your setup code here, to run once:
  DDRF|=(1<<PF0);
  DDRF&=~(1<<PF1);
  PORTF|=(1<<PF1);//enabling internal pull up resistor to avoid floating values.
  PORTK|=(1<<PK0);//enabling internal pull up resistor to avoid floating values.
  PORTA|=(1<<PA0);//enbaling internal pull up resistor
  DDRK|=(1<<PK1);
  DDRK&=~(1<<PK0);
  DDRA|=(1<<PA0);
}
void loop() {
  // put your main code here, to run repeatedly:
  if(!(PINF&(1<<PF1))){
    PORTF|=(1<<PF0);
  }
  else{
    PORTF&=~(1<<PF0);
  }
  if(!(PINK&(1<<PK0))){
    PORTK|=(1<<PK1);
  }
  else{
    PORTK&=~(1<<PK1);
  }
  if(!(PINA&~(1<<PA0))){
    PORTA|=0xFF;
  }
  else{
    PORTA|=0xFF;
  }
}