import string
cryptogram = "gfmncwmsbgblrrpylqjyrcgrzwfylbrfyrq"$#abbreviated version of the cryptogram

cryptolist=list(cryptogram)

def alpha_num_dic(): #creates dictionary with alphabet assigned nums 1 thru 26
    alpha= (string.ascii_lowercase)
    alphalist = list(alpha)
    numrange=range (1,27)
    alphadict = dict(zip(alphalist,numrange))
    return alphadict

def dictionary(y): #cryptolist passed in
    dictlist = []
    b=alpha_num_dic()
    for item in y: #loop cryptolist
        getkey=b[item] #each cryptolist item is the key for a lookup
        dictlist.append(getkey) #assign value to dictlist
    conversion(dictlist,alpha_num_dic)

def conversion(z,dictionary):
    newnum=[]
    for value in z:
        if value < 25:
            value += 2
        elif value == 25:
            value = 1
        elif value == 26:
            value = 2
        newnum.append(value)
    reverse_lookup(dictionary,newnum)

#works up til here. I can't figure out how to iterate through a dictionary.
def reverse_lookup (dictionary,newnum):
    for item in dictionary: #for passed value in dictionary
        if dictionary[item] == newnum: # if dict[value] ==
            print item

dictionary(cryptolist)