Добавить элементы столбца из одного файла в другой

f=open("191205.txt","r",encoding="utf8")
arr=[]
for line in f:
    tmp=line.strip().split(' ')
    arr.append(tmp)
f.close()
 
f=open("out.txt","w",encoding="utf8")
for i in range(len(arr)):
    f.write(arr[i][2]+'\n')
f.close()
 
g=open("191205_b.txt","r",encoding="utf8")
arr=[]
for line in g:
    tmp=line.strip().split(' ')
    arr.append(tmp)
f.close()
 
f=open("191205_b.txt","r",encoding="utf8") 
f=open("out.txt","w",encoding="utf8")
for [i][2] in "191205_b.txt":
    if i in "out.txt":
        f.write(arr[i][2]+'\n')

with open('input.txt', 'r') as f:
    full_txt = f.read().splitlines()
    needar_one = [' '.join(i.split()[5] for i in full_txt)]
with open('output.txt', 'w') as s:
    print(needar_one, file=s)
with open('input2.txt', 'r') as f2:
    full_txt2 = f2.read().splitlines()
    needar_two = [' '.join(i.split()[2] for i in full_txt2)]
    print(needar_one)
    print(needar_two)
    for i in needar_one:
        for j in needar_two:
            if i != j:
                with open('output.txt', 'a') as s2:
                    print(j, file=s2)

print(' '.join(needar_one), file=s)