Struggling to loop through array in a .txt file

I tried looping through a .txt file that has 101 subarrays in a single array but that didn't work because all characters are strings meaning it is a 0d array. I have no idea how to overcome this, because this is the first I am dealing with .txt files. How do i convert it to the type I want it to be, and be able to loop through the numbers in the file as normal?

import numpy as np
import matplotlib.pyplot as plt
import time

#Opening file
with open("1a_shuffled.txt", "r") as file:
    kfc = file.read()

#placing file content in np.array array
array = np.array(kfc)

#function for insertion sort
def insertion_sort(list):
    start = time.time()
    for sublist in list:
        for i in range(1,len(sublist)):
            currentElement = sublist[i]
            currentPosition = i - 1

            while currentPosition >=0 and sublist[currentPosition] > currentElement:
                sublist[currentPosition + 1] = sublist[currentPosition]
                currentPosition = currentPosition -1

            sublist[currentPosition + 1] = currentElement
    end = time.time()
    print(end - start)

#calling the function and printing it
insertion_sort(array)
print(array)
import numpy as np
import matplotlib.pyplot as plt
import time


#Opening file
with open("1a_shuffled.txt", "r") as file:
    kfc = file.read()


#placing file content in np.array array
array = np.array(kfc)


#function for insertion sort
def insertion_sort(list):
    start = time.time()
    for sublist in list:
        for i in range(1,len(sublist)):
            currentElement = sublist[i]
            currentPosition = i - 1


            while currentPosition >=0 and sublist[currentPosition] > currentElement:
                sublist[currentPosition + 1] = sublist[currentPosition]
                currentPosition = currentPosition -1


            sublist[currentPosition + 1] = currentElement
    end = time.time()
    print(end - start)


#calling the function and printing it
insertion_sort(array)
print(array)