# Miller-Ranum listing 4.7

def mode(alist):
    countdict = {}
    
    for item in alist:
        if item in countdict:
            countdict[item] = countdict[item] + 1
        else:
            countdict[item] = 1

    countlist = countdict.values()
    maxcount = max(countlist)

    modelist = []
    for item in countdict:
        if countdict[item] == maxcount:
            modelist.append(item)

    return modelist