<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def recpgr(body, rectan, re, f):
 """ Convert rectangular coordinates to planetographic coordinates. http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/recpgr_c.html :param body: Body with which coordinate system is associated. :type body: str :param rectan: Rectangular coordinates of a point. :type rectan: 3-Element Array of floats :param re: Equatorial radius of the reference spheroid. :type re: float :param f: Flattening coefficient. :type f: float :return: Planetographic longitude (radians), Planetographic latitude (radians), Altitude above reference spheroid :rtype: tuple """

    body = stypes.stringToCharP(body)
    rectan = stypes.toDoubleVector(rectan)
    re = ctypes.c_double(re)
    f = ctypes.c_double(f)
    lon = ctypes.c_double()
    lat = ctypes.c_double()
    alt = ctypes.c_double()
    libspice.recpgr_c(body, rectan, re, f, ctypes.byref(lon), ctypes.byref(lat),
                      ctypes.byref(alt))
    return lon.value, lat.value, alt.value