diff --git a/15/b/2.py b/15/b/2.py
new file mode 100644
index 0000000..a0b537e
--- /dev/null
+++ b/15/b/2.py
@@ -0,0 +1,17 @@
+def check(S):
+   if len (S.replace(" ", "")) != 16:
+      return False
+   for i in range(len(S)):
+      if i%5==4:
+         if S[i] != " ":
+            return False
+      else:
+         if not S[i].isdigit():
+            return False
+         
+   x = 0
+   for i in S.replace(" ", ""):
+      x += int(i)
+   if not x%10:
+      return True
+   return False