diff --git a/program.py b/program.py
index a9308c2..70f82e1 100644
--- a/program.py
+++ b/program.py
@@ -57,15 +57,15 @@ class RegexInterpreter(AbstractInterpreter):
         make_reg = lambda formula,pattern: 'echo "{0}" | grep -P "{1}"'.format(formula,pattern)
         def check_assertion(formula, pattern):
             cmd = make_reg(formula,pattern)
-            print("EXECUTING... ",cmd)
+            #print("EXECUTING... ",cmd)
             result = subprocess.run([cmd], shell=True, stdout=subprocess.PIPE)
-            return len(result.stdout)>0
+            return not len(result.stdout)>0
        
         cmd =make_reg(formula,'^(\((?:[^()]++|(?1))*\))$')
-        print("EXECUTING... ",cmd)
+        #print("EXECUTING... ",cmd)
        
         result = subprocess.run([cmd], shell=True, stdout=subprocess.PIPE)
-        return None
+       
         isValid = len(result.stdout)>0
         if not isValid: return False
 
@@ -182,7 +182,7 @@ if len(sys.argv) > 1 :
     i = ProperInterpreter()
     if '-g' in sys.argv: 
         i = RegexInterpreter()
-    print(sys.argv)
+    #print(sys.argv)
 
     if '-f' in sys.argv:
         #open from file