diff --git a/validity_check.py b/validity_check.py
index 4e8bbabf8bd061389af3fa1f2ec54ba69501db33..1190bbbba0ca2c3bf9c19ee829388b253c5e8aa4 100644
--- a/validity_check.py
+++ b/validity_check.py
@@ -11,24 +11,22 @@ if __name__ == "__main__":
         print("You modify wrong number of lines !")
         exit(1)
 
-    if author not in modifs[0] and (author not in modifs[1]) :
-        print("You modify the line of another student !\n")
-        exit(1)
-
     curr_line = modifs[1].split(',')
+    prev_line = modifs[1].split(',')
 
     if len(curr_line) != 4:
         print('You broke file format by suppressing/adding "," !\n')
         exit(1)
 
-    prev_line = modifs[1].split(',')
-    modifs[0]= modifs[0][1:]
-    modifs[1]=modifs[1][1:]
-    
-    for i in range(len(curr_line)):
-        if i<3 and prev_line[i] != curr_line[i] :
+    if author not in curr_line[0] and (author not in prev_line[0]) :
+        print("You modify the line of another student or use a different email than the one written !\n")
+        exit(1)
+
+    for i in range(0,4):
+        if prev_line[i] != curr_line[i] :
             print('You modify your data !\n')
             exit(1)
-    if(curr_line[3]) !='VU' and (curr_line[3]) !=' VU' and (curr_line[3]) !='VU ':
-        print('You have to write "VU" in the last column !\n')
+    answer = curr_line[3].lower()
+    if answer != 'oui' and answer !=' oui' and answer !='oui ':
+        print('You have to write "oui" in the last column !\n')
         exit(1)