#!/usr/bin/env python

# -*- coding: utf-8 -*-

def printList(datalist = []):

  for i in range(len(datalist)):

    print datalist[i]

def mergeList(list1, list2 = []):

  if len(list1) == 0:

    return list2

  if len(list2) == 0:

    return list1

  list3 = []

  for list1_i in range(len(list1)):

    for list2_i in range(len(list2)):

      list3_item = str(list1[list1_i]) + '-' + str(list2[list2_i])

      list3.append(list3_item)

  return list3

def row2columnList(datalist = []):

  list_cr = [[]]

  for col in range(len(datalist[0])):

    list_tmp = []

    for row in range(len(datalist)):

      list_tmp.append(datalist[row][col])

    list_cr.append(list_tmp)

  return list_cr

def traversalPath(datalist = []):

  list_tmp = []

  for row in range(len(datalist)):

    list_tmp = mergeList(list_tmp, datalist[row])

  return list_tmp

if __name__=='__main__':

  M = [['a1', 'b1', 'c1', 'd1', 'e1'],['a2', 'b2', 'c2', 'd2', 'e2'],['a3', 'b3', 'c3', 'd3', 'e3']]

  M_tmp = row2columnList(M)

  tp_list = traversalPath(M_tmp)

  printList(tp_list)

  print len(tp_list)