Фиксировать клетки после 5 букв

import tkinter as tk
from tkinter import ttk
 
index=0 
 
def enter(*a):
    word=entry_var.get()
    print(word)
    for i in range(30):
        buttons[i].config(text='')
        
    for t in range(0,len(word)):
        buttons[t].config(text=word[t])
    
root = tk.Tk()
root.title("Wordle,but cheap")
root.geometry("200x300")
 
entry_var = tk.StringVar(root)
entry_var.trace("w", enter)
 
buttons=list()
 
entry = tk.Entry(root, width=25,textvariable=entry_var)
entry.grid(row=7, column=0, columnspan=70, padx=10, pady=0)
 
for i in range(0,30):
    buttons.append(tk.Button(root, width = 3))
    buttons[i].grid(row=i//5, column=i%5, padx=2, pady=5, rowspan=1) 
 
root.mainloop()

import tkinter as tk
from tkinter import ttk
 
index=0 
tmp=0
 
def enter(*a):
 
    global tmp,index
    word=entry_var.get()
    
    i=0
    for t in range(0,len(word)):
        buttons[i+index].config(text=word[t])
        i=i+1
        if i==5:
            index+=5
            i=0
            entry_var.set("")
            break
 
root = tk.Tk()
root.title("Wordle,but cheap")
root.geometry("200x300")
 
entry_var = tk.StringVar(root)
entry_var.trace("w", enter)
 
buttons=list()
 
entry = tk.Entry(root, width=25,textvariable=entry_var)
entry.grid(row=7, column=0, columnspan=70, padx=10, pady=0)
 
for i in range(0,30):
    buttons.append(tk.Button(root, width = 3))
    buttons[i].grid(row=i//5, column=i%5, padx=2, pady=5, rowspan=1) 
 
root.mainloop()