from browser import document


def arrcomb(arr1, arr2, c1, c2, c3):

  if len(arr1) == 0:
    arr1 = [0]
  if len(arr2) == 0:
    arr2 = [0]

  biggest = max(len(arr1), len(arr2))
  smaller = min(len(arr1), len(arr2))

  v = [  (c1*arr1[i%len(arr1)]+c2*arr2[i%len(arr2)]+c3)%26 for i in range(biggest) ]
  return v

def a2w(aaa):
   return ''.join([chr(97+aaa[i]) for i in range(len(aaa))])

def cipher(ev):
    aval = document["inpa"].value.lower()
    bval = document["inpb"].value.lower()
    alen = len(aval)
    blen = len(bval)
    arra = [ord(c)-97 for c in aval]
    arrb = [ord(c)-97 for c in bval]
    
    # array time
    
    m = min(alen,blen)
    
    apb = a2w(arrcomb(arra, arrb, 1, 1, 0))
    atb = a2w(arrcomb(arra, arrb, 1, -1, 0))
    bta = a2w(arrcomb(arra, arrb, -1, 1, 0))
    ccc = a2w(arrcomb(arra, arrb, int(document["ca"].value), int(document["cb"].value), int(document["cc"].value)))
    
    document["aplusb"].innerHTML = '<span class="s">'+apb[0:m]+'</span>'+apb[m:]
    document["atakeb"].innerHTML = '<span class="s">'+atb[0:m]+'</span>'+atb[m:]
    document["btakea"].innerHTML = '<span class="s">'+bta[0:m]+'</span>'+bta[m:]
    document["comb"].innerHTML = '<span class="s">'+ccc[0:m]+'</span>'+ccc[m:]

document.bind("keyup", cipher)
document.bind("keydown", cipher)