here is the script you requested:
```python
# this allows access to the Tcl/Tk GUI toolkit
import tkinter

# this creates the base window and assigns it to the variable "root"
root = tkinter.Tk()

# a text input box is called "entry" in tkinter, this code creates one and attaches it to the base window
entry = tkinter.Entry(root) 
entry.pack()

# this function retrieves the text from the previously created entry box and saves it to file "input.txt"
def saveEntryContent():
    # the open() function opens a file and returns it as a file object.
    with  open("input.txt", "w") as file:
        # this retrieves the text inside of the entry box
        content = entry.get()
        # this writes the text to the file and then closes it
        file.write(content)
        file.close()

# this creates a button that is attached to the base window, sets the text on the button to "save" and makes the button call the function "saveEntryContent" when pressed
button = tkinter.Button(root, text ="save", command = saveEntryContent)
button.pack()

# this makes the program loop until the user exits the window or waits for any events from the user.
root.mainloop()
```

this script creates a window with a text entry and a save button. when you press the save button, the script saves the contents of the entry to a file called "input.txt". do you need me to explain any part in greater detail?
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