#include <LiquidCrystal_I2C.h>

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

// set 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 LCD
  lcd.init();
  // turn on LCD backlight                      
  lcd.backlight();  
}

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