#include<Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#include <Servo.h>

Servo myservo;
const byte ROWS=4;
const byte COLS=4;
char keys[ROWS][COLS]={
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'},
};
byte rowpins[ROWS]={9,8,7,6};
byte colpins[COLS]={5,4,3,2};

Keypad keypad=Keypad(makeKeymap(keys),rowpins,colpins,ROWS,COLS);
String input="";
String password="ABCD";

void setup(){
  myservo.attach(10);
  myservo.write(0);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Enter password");
}
void loop(){
  char key=keypad.getKey();
  if(key){
    if(key=='*'){
      if(input.length()>0){
        lcd setCursor(input.length()1);
        lcd.print("  ");
        input.remove(input.length()-1)
      }
    }
    else if(key=='#'){
      lcd.clear();
      if(input==password){
        lcd.setCursor(0,1);
        lcd.print("ACCESS GRANTED");
        myservo.write(90);
        delay(2000);
          myservo.write(0);

      }
      else{
        lcd.setCursor(0,1);
        lcd.print("ACCESS DENIED");
      }
      delay(1000);
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Enter password");
      input="";
    }
    else{
      input+=key;
      lcd.setcursor(input.length()-1,1);
      lcd.print(key);
    }
  }
  delay(100);
}