1 files changed, 7 insertions, 0 deletions
diff --git a/progs/a455.py b/progs/a455.py
new file mode 100644
index 0000000..45278b7
--- /dev/null
+++ b/progs/a455.py
@@ -0,0 +1,7 @@
+def is_undulating(n): 
+	if (len(n) <= 2): 
+		return False
+	for i in range(2, len(n)): 
+		if (n[i - 2] != n[i]): 
+			return False
+	return True
+\ No newline at end of file