diff --git a/main.py b/main.py
index 60ac061..ffc3123 100644
--- a/main.py
+++ b/main.py
@@ -1,4 +1,4 @@
 from reader import *
 
-cal = input("Entrez votre calcul en NPI : ")
-print(npi2tree(tokenize(cal)).evalue())
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+cal = str(input("Entrez votre calcul en NPI : "))
+print(npi2tree(shutting_yard(tokenize(cal))).evalue())
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diff --git a/reader.py b/reader.py
index 916922b..fe95253 100644
--- a/reader.py
+++ b/reader.py
@@ -2,7 +2,7 @@ from expression import Token, Expression
 from lib.Pile import Pile_chaine as Pile
 from lib.File import File_chaine as File
 
-def tokenize(text):
+def tokenize(text: str) -> list:
     buffer = ""
     tokens = []
     for char in text:
@@ -12,7 +12,6 @@ def tokenize(text):
         else:
             #PUSH
             if buffer != "":
-                print("a")
                 tokens.append(Token(Token.NUMBER, buffer))
                 buffer = ""
             #SINGLE CHAR
@@ -23,11 +22,9 @@ def tokenize(text):
                     tokens.append(Token(Token.OPERATOR, char))
     if buffer != "":
         tokens.append(Token(Token.NUMBER, buffer))
-    for token in tokens:
-        print(token.type, ":", token.val)
     return tokens
 
-def shutting_yard(tokens):
+def shutting_yard(tokens: list) -> File:
     output = File()
     opertator = Pile()
     for token in tokens:
@@ -36,44 +33,39 @@ def shutting_yard(tokens):
         elif token.type == Token.FUNCTION:
             opertator.empiler(token)
         elif token.type == Token.OPERATOR:
-            if not opertator.est_vide():
-                o2 = opertator.sommet()
-                a = o2 != "("
-                print(o2.val)
-                b = Token.getPrecedence(o2.val) > Token.getPrecedence(token.val)
-                c = Token.getPrecedence(token.val) == Token.getPrecedence(o2.val)
-
-                while a and (b or (c)): #and d))
-                    output.enfiler(opertator.depiler())
+            while (not opertator.est_vide() and opertator.sommet().val != "(") and (Token.getPrecedence(opertator.sommet().val) > Token.getPrecedence(token.val) or (Token.getPrecedence(token.val) == Token.getPrecedence(opertator.sommet().val) and token.val != "^")):
+                output.enfiler(opertator.depiler())
             opertator.empiler(token)
         elif token.val == "(":
             opertator.empiler(token)
         elif token.val == ")":
-            while opertator.sommet() != "(":
+            while not opertator.est_vide() and opertator.sommet().val != "(":
                 assert not opertator.est_vide()
                 output.enfiler(opertator.depiler())
-            assert opertator.sommet() == "("
+            assert opertator.sommet().val == "("
             opertator.depiler()
             if opertator.sommet().type == Token.FUNCTION:
                 output.enfiler(opertator.depiler())
 
     while not opertator.est_vide():
-        assert opertator.sommet != "("
+        assert opertator.sommet().val != "("
         output.enfiler(opertator.depiler())
 
     return output
 
 
-def npi2tree(tokens):
+def npi2tree(tokens: File) -> Expression:
     pile = Pile()
-    for token in tokens:
-        if token in ["+", "-", "*", "/"]:
-            exp = Expression(token, pile.depiler(), pile.depiler())
+    while not tokens.est_vide():
+        token = tokens.defiler()
+        if token.val in ["+", "-", "*", "/"]:
+            exp = Expression(token.val, pile.depiler(), pile.depiler())
             pile.empiler(exp)
         else:
-            pile.empiler(Expression(token))
+            pile.empiler(Expression(token.val))
     return pile.depiler()
 
 if __name__ == "__main__":
-    print(shutting_yard(tokenize("2+44(4+21)")))
+    a = npi2tree(shutting_yard(tokenize("2+44*(4+21)"))).evalue()
+    print(a)
     #print(npi2tree(tokenize("6 4 3 + *")))
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