1 files changed, 13 insertions, 0 deletions
diff --git a/progs/a154.py b/progs/a154.py
new file mode 100644
index 0000000..38780bc
--- /dev/null
+++ b/progs/a154.py
@@ -0,0 +1,13 @@
+def second_smallest(numbers):
+  if (len(numbers)<2):
+    return
+  if ((len(numbers)==2)  and (numbers[0] == numbers[1]) ):
+    return
+  dup_items = set()
+  uniq_items = []
+  for x in numbers:
+    if x not in dup_items:
+      uniq_items.append(x)
+      dup_items.add(x)
+  uniq_items.sort()    
+  return  uniq_items[1] 
+\ No newline at end of file