diff --git a/triangle.py b/triangle.py
index 7017bdb..8d6fe5b 100644
--- a/triangle.py
+++ b/triangle.py
@@ -1,5 +1,5 @@
 import re
-n=input()
+n=str(input())
 l=list(n)
 if(re.match("^[1-9]{2}[A-Z][1-9]{3}-[1-9]{2}",n)):
     if(l[2]=="A" or l[2]=="E" or l[2]=="I" or l[2]=="O" or l[2]=="U" or l[2]=="Y"):