High score updating system

def updatesc(sc):
  f = open("yes.txt")
  content = f.read()
  f.close()
  if content == "":
    f = open("yes.txt","w")
    f.write(str(sc))
    print("Thats ur first high score!")
  else:
    if int(sc) > int(content):
      f = open("yes.txt","w")
      f.write(str(sc))
      f.close()
      print("Updated!")
a = input("Enter a number")
updatesc(a)