def rgb2hex(r: int, g: int, b: int) -> str:
  """Convert RGB integers to hexadecimal string

  Args:
    r (int): Red (between 0 and 255)
    g (int): Green (between 0 and 255)
    b (int): Blue (between 0 and 255)

  Returns
    str: Hexadecimal string"""
  return "".join(
    hex(v)[2:].rjust(2, "0")
    for v in (r, g, b)
  )