#include <LiquidCrystal_I2C.h>
int x=0;
int y=0;
int z=0;

LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("ABCDEFGHIJKLMNOP");
  lcd.setCursor(0, 1);
  lcd.print("ABCDEFGHIJKLMNOP");
  delay(100);
}

void loop() {
  lcd.setCursor(0, 0);
  lcd.print("ABCDEFGHIJKLMNOP");
  lcd.setCursor(0, 1);
  lcd.print("ABCDEFGHIJKLMNOP");
for (x=15; x>=0; x--)
{
  lcd.setCursor(x, 0);
  lcd.print(" ");
  
  for (y=0; y<x; y++)
  {
   
        lcd.setCursor(y, 1);
    lcd.print(" ");

   }
  delay(500);
   lcd.setCursor(0, 1 );
   lcd.print("ABCDEFGHIJKLMNOP");
}
}