import os
import csv
import linecache

input = open("size.txt", "r")
output = open ("size_final.csv", "w")

ecrire = csv.writer(output)

ecrire.writerow(('Size','Strain'))

lecture = input.readlines()


i=1
t=2

while i <= len(lecture) and t<= len(lecture):
    v = linecache.getline('size.txt', i).rstrip("\n\r")
    w = linecache.getline('size.txt', t).rstrip("\n\r")
    ecrire.writerow((v,w))
    i = i + 2
    t = t + 2

input.close()
output.close()