int horz_pin = A0;
int vert_pin = A1;
int sel_pin = 2;

int horz_val, vert_val, sel_val;

void setup() {
  pinMode(sel_pin, INPUT);
  Serial.begin(9600);
}

void loop() {
  horz_val = analogRead(horz_pin);
  vert_val = analogRead(vert_pin);
  sel_val = digitalRead(sel_pin);

  Serial.print("Horz: ");
  Serial.print(horz_val);
  Serial.print("\tVert: ");
  Serial.print(vert_val);
  Serial.print("\tSel: ");
  Serial.println(sel_val);
}