How to separate words separated by tabs in pythond

My file look that:

abc 1
bca 2

How to get texts(abc and bca) and append to array and get numbers and append to another array?
I made this:

plik = open("testcase.txt", "r")
imie = []
dlugosc = []
for line in plik:
    for word in line.split():
        imie.append(word)

Now when i print "imie" that shows everythinkg.

>Solution :

you can try this to check digit

a_string = "abc 1 bca 2"
numbers = []
for word in a_string.split():
    if word.isdigit():
        numbers.append(int(word))

print(numbers)

OUTPUT : [1,2]