void setup() {
  for(int i=0; i<10; ++i){
    pinMode(i, OUTPUT);
  }
  pinMode(13, OUTPUT);
  pinMode(10, INPUT);
  pinMode(11, INPUT);

}
int pin1 = 0;
int pin2 = 9;
void loop() {
  boolean b1, b2;
  b1 = digitalRead(10);
  b2 = digitalRead(11);
  if(b1 == 1 && b2 == 1){
    pin1 = 0;
    pin2 = 9;
  }
  if(b1 == 0 && b2 == 0){
    digitalWrite(pin1, HIGH);
    digitalWrite(pin2, HIGH);
    delay(25);
    digitalWrite(pin1, LOW);
    digitalWrite(pin2, LOW);
    delay(25);
    ++pin1;
    --pin2;
    if(pin1 == 10)
      pin1 = 0;
    if(pin2 == -1)
      pin2 = 9;
  }
  if(b1 == 0 && b2 != 0){
    digitalWrite(pin1, HIGH);
    delay(100);
    digitalWrite(pin1, LOW);
    delay(100);
    ++pin1;
    if(pin1 == 10)
      pin1 = 0;
  }
  if(b1 != 0 && b2 == 0){
    digitalWrite(pin2, HIGH);
    delay(100);
    digitalWrite(pin2, LOW);
    delay(100);
    --pin2;
    if(pin2 == -1)
      pin2 = 9;
  }
}