goal is to be able to set servo to value entered in serial

#include <Servo.h>

Servo myservo;  // create servo object to control a servo
                // a maximum of eight servo objects can be created

int pos = 0;    // variable to store the servo position

void setup()
{
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
  Serial.begin(9600);
  while (! Serial);
  Serial.println("Enter desired servo position");
}

void loop()
{
  String content = "";
  char character;

  while (Serial.available())
  {
    character = Serial.read();
    delay(5);
    content.concat(character);
  }
  if (content != "")
  {
    int spos = atoi(content);
    myservo.write(spos);
  }
}