#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
int led1= 5;
int led2= 11;
int sw1= 6;
int sw2= 7;
int sw3= 8;
int sw4= 4;
String a;
void setup() {
  // put your setup code here, to run once:
  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);

}

void loop() 
{
  int push1=digitalRead(sw1);
  int push2=digitalRead(sw2);
  int push3=digitalRead(sw3);
  int push4=digitalRead(sw4);
  if (push1 == 1)
  {
    a += "M";
    delay(1000);
    Serial.print(a);
  }
  if (push2 ==1)
  {
    a += "E";
    delay(1000);
    Serial.print(a);
  }
  if (push3 == 1)
  {
    a += "N";
    delay(1000);
    Serial.print(a);
  }
  if (push4 ==1)
  {
    a += "U";
    delay((1000));
    Serial.print(a);
  }
  if (a.length() >=5)
  {
  if (a == "MEENU")
  {
   digitalWrite(led1, HIGH);
    delay(1000);
    
    lcd.setCursor(0,1);
    lcd.print("PASSWORD MATCHED"); 
  }
  else
  {
  digitalWrite(led2, HIGH);
    delay(1000);
   
    lcd.setCursor(0,0);
    lcd.print("INCORRECT PASSWORD");
  
  }
  // put your main code here, to run repeatedly:

}
}