#include <LiquidCrystal.h>

int count1=0;
int count2=0;
LiquidCrystal lcd(18, 5, 17, 16, 4, 0);
void setup() {
// set up the LCD's number of columns and rows:
Serial.begin(115200);
lcd.begin(16, 2);

}
void loop() 
{
}
void serialEvent()
{
   while(Serial.available())
 {
  char ch = Serial.read();
  Serial.print(ch);
  counts(ch);
 }
}
void counts(char ch)
{
  if(ch=='A')
  {
    count1+=1;
  }
  if(ch=='B')
  {
    count1-=1;
  }
  if(ch=='C')
  {
    count2+=1;
  }
  if(ch=='D')
  {
    count2-=1;
  }
  if(ch=='E')
  {
    count2=0;
    count1=0;
  }
    lcd.clear();
    lcd.setCursor(5, 0);
    lcd.print("Count1 : "+String(count1));
    lcd.setCursor(5, 1);
    lcd.print("Count2 : "+String(count2));
    delay(1000);
}