#include <Keypad.h>
const uint8_t ROWS =4;
const uint8_t COLS =4;

char Keys [ROWS][COLS]{
{'1','2','3','4'},
{'4','5','6','8'},
{'7','8','9','c'},
{'*','0','#','D'},
};
uint8_t colPins [COLS] = {A1,A2,A3,A4};
uint8_t rowPins [ROWS] = {5,4,3,2};
Keypad keypad = Keypad(makeKeymap(Keys),rowPins,colPins,ROWS,COLS);

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

}

void loop() {
  char text =keypad.getKey();

  if (text != NO_KEY){
  Serial.println(text);
}

}