1 files changed, 6 insertions, 0 deletions
diff --git a/progs/a535.py b/progs/a535.py
new file mode 100644
index 0000000..f72fd65
--- /dev/null
+++ b/progs/a535.py
@@ -0,0 +1,6 @@
+def count_occurance(s):
+  count=0
+  for i in range(len(s)):
+    if (s[i]== 's' and s[i+1]=='t' and s[i+2]== 'd'):
+      count = count + 1
+  return count
+\ No newline at end of file