1 files changed, 9 insertions, 0 deletions
diff --git a/progs/a503.py b/progs/a503.py
new file mode 100644
index 0000000..5046f85
--- /dev/null
+++ b/progs/a503.py
@@ -0,0 +1,9 @@
+def extract_singly(test_list):
+  res = []
+  temp = set()
+  for inner in test_list:
+    for ele in inner:
+      if not ele in temp:
+        temp.add(ele)
+        res.append(ele)
+  return (res) 
+\ No newline at end of file