diff --git a/Stockfish mais pour les maths.py b/Stockfish mais pour les maths.py
index 1c81608..ae10dd9 100644
--- a/Stockfish mais pour les maths.py	
+++ b/Stockfish mais pour les maths.py	
@@ -1,4 +1,5 @@
 from Pile import Pile_chaine
+from tkinter import *
 
 class Expression:
     def __init__(self, valeur, gauche, droit):
@@ -27,9 +28,13 @@ def dfs_post(a):
 def dfs_in(a, expstr):
     if a == None:
         return expstr
+    if a.gauche is not None or a.droit is not None:
+        expstr += "("
     expstr = dfs_in(a.gauche, expstr)
-    expstr = expstr + str(a.valeur)
+    expstr += str(a.valeur)
     expstr = dfs_in(a.droit, expstr)
+    if a.gauche is not None or a.droit is not None:
+        expstr += ")"
     return expstr
 
 def npi2tree(exptext):
@@ -44,7 +49,24 @@ def npi2tree(exptext):
             expression.empiler(Expression(int(element), None, None))
     return expression.sommet()
 
-exp = "6 4 3 * +"
+def insert(text):
+    pass
+
+window = Tk()
+window.title("Stockfish mais pour les maths")
+window.geometry(f"300x400+50+50")
+canvas = Canvas(window, width = 300, height = 400, bg = "#abcdef")
+canvas.pack()
+lcdscreen = Entry(window, width = 35)
+lcdscreen.place(x=5, y=5)
+
+touches = "0 1 2 3 4 5 6 7 8 9 + * - / ^".split()
+
+for touche in touches:
+    button = Button(window, text = touche, command = lambda touche=touche: insert(touche), bg = "#fedcba")
+    button.place(x=touches.index(touche) // 3 * 50 + 10, y = touches.index(touche) % 3 * 50 + 100)
+
+exp = "6 4 3 + *"
 exp = npi2tree(exp)
 
 print(exp)