#include <LiquidCrystal_I2C.h> 
LiquidCrystal_I2C a(0x27,20,4);
int b=17,c=0;
void setup() {
  a.init();
  a.backlight();
}

void loop() {
  // put your main code here, to run repeatedly:
a.setCursor(c,1);
a.print("saya ");

a.setCursor(b,3);
a.print("aku");
delay(200);
b--;
c++;
a.clear();
if(b==0){
b=17;
c=0;

}
}