Displaying characters entered by Computer to LCD connected to Arduino Mega

Program Code:
#include<LiquidCrystal.h>

LiquidCrystal lcd(53,52,51,50,49,48);
int b=0;

void setup() {
Serial2.begin(9600);
lcd.begin(16,2);
lcd.clear();
lcd.setCursor(0,0);
}

void loop() {
char a;
if(Serial2.available()){
a=Serial2.read();
lcd.setCursor(b,0);
lcd.print(a);
b++;
}
delay(10);
}

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