I reset the ESP32-S3 board and uploaded simple blink code , but nothing happens

#define LED_BUILTIN 48 

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_BUILTIN,INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
 digitalWrite(LED_BUILTIN,HIGH);
 delay(1000);
 digitalWrite(LED_BUILTIN,LOW);
 delay(1000);
}