#include <LiquidCrystal.h>
LiquidCrystal lcd(13,12,11,10,9,8);
char a=0;char b=0;
void setup() {
  lcd.begin(16,4);
  pinMode(2,INPUT_PULLUP);pinMode(3,INPUT_PULLUP);pinMode(4,INPUT_PULLUP);
}
void loop() {
  while(digitalRead(2)==1){ 
    b=0;
    lcd.setCursor(a,b); 
    lcd.write("Hello");

  while(digitalRead(2)==0) {
   for(a=0;a<11;a++){
    while(digitalRead(2)==1){ 
      lcd.setCursor(a,b);
      lcd.write("Hello");
   while(digitalRead(3)==0) {
    lcd.clear();
    lcd.setCursor(a,1); 
    lcd.write("Hello");
    delay(300); 
    lcd.clear();
}
    while(digitalRead(4)==0){
      a--;
      lcd.setCursor(a,0); 
    lcd.write("Hello");
    delay(300); 
    lcd.clear();
    if(a<0){a=11;}
  }
  }
  lcd.setCursor(a,b); 
    lcd.write("Hello");
    delay(300); 
    lcd.clear();
    }
    }
    while(digitalRead(3)==0){
      lcd.clear();
      lcd.setCursor(a,1); 
    lcd.write("Hello");
    delay(300); 
    lcd.clear();
    }
    while(digitalRead(4)==0){
      for(a=11;a>0;a--){
       lcd.setCursor(a,0); 
       lcd.write("Hello");
       delay(300); 
       lcd.clear();
       while(digitalRead(4)==1){
        lcd.setCursor(a,0); 
        lcd.write("Hello");
        delay(300); 
        lcd.clear();
        while(digitalRead(2)==1){ 
    b=0;
    lcd.setCursor(a,b); 
    lcd.write("Hello");

  while(digitalRead(2)==0) {
   for(a=0;a<11;a++){
    while(digitalRead(2)==1){ 
      lcd.setCursor(a,b);
      lcd.write("Hello");
   while(digitalRead(3)==0) {
    lcd.clear();
    lcd.setCursor(a,1); 
    lcd.write("Hello");
    delay(300); 
    lcd.clear();
}
    while(digitalRead(4)==0){
      a--;
      lcd.setCursor(a,0); 
    lcd.write("Hello");
    delay(300); 
    lcd.clear();
    if(a<0){a=11;}
  }
  }
  lcd.setCursor(a,b); 
    lcd.write("Hello");
    delay(300); 
    lcd.clear();
    }
    }
       }
      }
      }
      }
    }
    }