#include <LiquidCrystal_I2C.h>

// Define the LCD number of columns and rows
const int lcdColumns = 16;
const int lcdRows = 2;

// Define the LCD address, number of columns, and rows
// If you don't know your display address, run an I2C scanner sketch
LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);

void setup() {
  // Initialize the LCD
  lcd.init();
  // Turn on the LCD backlight
  lcd.backlight();
}

void loop() {
  // Loop from ASCII 'a' to ASCII 'z':
  for (int thisLetter = 'a'; thisLetter <= 'z'; thisLetter++) {
    // Clear the LCD screen
    lcd.clear();
    
    // Loop over the rows:
    for (int thisRow = 0; thisRow < lcdRows; thisRow++) {
      // Loop over the columns:
      for (int thisCol = 0; thisCol < lcdColumns; thisCol++) {
        // Set the cursor position
        lcd.setCursor(thisCol, thisRow);
        // Print the letter
        lcd.write(thisLetter);
        delay(200);
      }
    }
  }
}