from math import pi

print ("Write the input for degree as such 'rd'")
print ("This is from radians to degrees\nYou may use kelvin(k), fahrenheit(f), and celcius(c) as well")

# This function gets information from the user
def inputs():

    unit = raw_input("What unit do we have and what are we converting to? > ")

    num = raw_input("How much of the unit is being converted? > ")

    # This checks to see if the input num is equal to a number
    # if not, return user to reinput a number
    try:
        num = int(num)
        UnitCon(unit, num)
    except ValueError:
        print ("Not a valid input, please input a number")
        inputs()

def UnitCon(unit, num):

    # Celcius to Kelvin

    if unit == "ck" in unit:
        ck =(num + 273)
        #number to string, adding unit at end
        kelvinString = str(ck) + ' K'
        print kelvinString

    # Kelvin to Celcius

    if unit == "kc" in unit:
        kc = (num - 273)
        celciusString = str(kc) + ' C'
        print celciusString

    # Fahrenheit to Kelvin

    if unit == "fk" in unit:
        fk = (((num-32)*float(.56))+273)
        kelvinString = str(fk) + ' K'
        print kelvinString

    #Kelvin to Fahrenheit

    elif unit == "kf" in unit:
        kf = (((num - 32)*float(.56))+273)
        fahrenheitString = str(kf) + ' F'
        print fahrenheitString


    #celcius to fahrenheit
    elif unit == "cf" in unit:
        cf = float((num - 32) * float(.5556))
        celciusString = str(cf) + ' C'
        print celciusString

    # fahrenheit to celcius

    elif unit == "fc" in unit:
        fc = float((num - 32)*float(.56))
        celciusString = str(fc) + ' C'
        print celciusString

    # radians to degrees

    elif unit == "rd" in unit:
        rd = float((num)*float(180/pi))
        degreeString = str(rd) + ' degrees'
        print degreeString

    # degrees to radians

    elif unit == "dr" in unit:
        dr = float((num)*float(pi/180))
        radianString = str(dr) + ' radians'
        print radianString

    else:
        print "Your input is invalid.\nPlease input a valid unit."
        inputs()


# starts program
inputs()