#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);  
  String message = "Ceci est une tres longue histoire sans fin ni faim";
  int messageLength = message.length();

void setup() {
  lcd.init();
  //lcd.backlight();
  lcd.clear();
}

void loop() {
  for (int i = 0; i < messageLength; i++) {
    lcd.clear();
    lcd.setCursor(0, 0);
    //lcd.print(message.substring(i));
    lcd.print(messageLength);
    delay(300);
  }
  lcd.clear();
  delay(300);

}