const int out1 = 13;
const int col1 = 12;
const int col2 = 11;
const int col3 = 10;
const int row1 = A0;
const int row2 = A1;
const int row3 = A2;


void setup() {
  Serial.begin(9600);

  pinMode(out1, OUTPUT);
  pinMode(col1, INPUT_PULLUP);
  pinMode(col2, INPUT_PULLUP);
  pinMode(col3, INPUT_PULLUP);
  pinMode(row1, INPUT_PULLUP);
  pinMode(row2, INPUT_PULLUP);
  pinMode(row3, INPUT_PULLUP);

  digitalWrite(out1, LOW);
}

void loop() {
  int col1State = digitalRead(col1);
  int col2State = digitalRead(col2);
  int col3State = digitalRead(col3);
  int row1State = digitalRead(row1);
  int row2State = digitalRead(row2);
  int row3State = digitalRead(row3);

  if (col1State == LOW && row1State == LOW) {
    Serial.print("1");
    delay(50);
  }
  if (col2State == LOW && row1State == LOW) {
    Serial.print("2");
    delay(50);
  }
  if (col3State == LOW && row1State == LOW) {
    Serial.print("3");
    delay(50);
  }
}