import string
key = 3


def encode(text):
    print "key:", key
    enc = ""
    
    for k in range (key):
        for n in range(1+(len(text) // key)):  
            i =  k + (key * n) 
            if (i < len (text)):              
                ch = text[i]
            else:
                ch = "*"
            if ch != "\n":
                enc += ch                 
            else:                      
                enc += "\n"   
    return enc

fInp = open("original.txt")
text = fInp.read()
fInp.close() 

print "Original:\n", text
krypto = encode(text)
print "Krypto:\n", krypto

fOut = open("secret.txt", "w")    
for ch in krypto:
    fOut.write(ch)
fOut.close()