#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd (0x27 , 16 ,2);
int led1 = 8;
int led2 = 4;
int sw1 = 5;
int sw2 = 6;
int sw3 = 2;
int sw4 = 3;
String a;
void setup() {
  lcd.init();
  lcd.backlight();
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(sw1, INPUT);
  pinMode(sw2, INPUT);
  pinMode(sw3, INPUT);
  pinMode(sw4, INPUT);
  Serial.begin(9600);
  // put your setup code here, to run once:

}

void loop() {
  int push1 = digitalRead(sw1);
  int push2 = digitalRead(sw2);
  int push3 = digitalRead(sw3);
  int push4 = digitalRead(sw4);
  if (push1 ==1)
  {
    a += "p";
    delay(1000);
    Serial.print(a);
  }
  if (push2 == 1)
  {
    a += "u";
    delay(1000);
    Serial.print(a);
  }
  if (push3 == 1)
  {
    a +="r";
    delay(1000);
    Serial.print(a);
    
  }
  if (push4 == 1)
  {
    a += "i";
    delay(1000);
    Serial.print(a);
  if(a.length()>=4)
  {
  if(a == "puri")
  {
   digitalWrite(led1, HIGH);
    delay(1000);
    lcd.setCursor(0,1);
    lcd.print("password matched ");
    delay(1000);
    Serial.print(a);
  }
  else
  {
    digitalWrite(led2, HIGH);
    digitalWrite(led1, LOW);
    lcd.setCursor(0,0);
    lcd.print("ALERT! ");
    delay(1000);
  }
  }

  }  
    
  

}