diff --git a/unit01_cipher_fundamentals/src/d_04.py b/unit01_cipher_fundamentals/src/d_04.py
index c6b9e7d..39f2bfa 100644
--- a/unit01_cipher_fundamentals/src/d_04.py
+++ b/unit01_cipher_fundamentals/src/d_04.py
@@ -46,6 +46,6 @@ def is_probable_prime(n):
 
 rtn=is_probable_prime(testval)
 if (rtn==True):
-	print str(testval) + " is a prime"
+	print (str(testval) + " is a prime")
 else:
-	print str(testval) + " is not a prime"
\ No newline at end of file
+	print (str(testval) + " is not a prime")