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diff --git a/challenge-273/spadacciniweb/python/ch-2.py b/challenge-273/spadacciniweb/python/ch-2.py
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+#!/usr/bin/env perl
+
+# Task 2: B After A
+# Submitted by: Mohammad Sajid Anwar
+# 
+# You are given a string, $str.
+# Write a script to return true if there is at least one b, and no a appears after the first b.
+# 
+# Example 1
+# Input: $str = "aabb"
+# Output: true
+# 
+# Example 2
+# Input: $str = "abab"
+# Output: false
+# 
+# Example 3
+# Input: $str = "aaa"
+# Output: false
+# 
+# Example 4
+# Input: $str = "bbb"
+# Output: true
+
+def out(str):
+    offset = str.find('b')
+    if offset >= 0 and str.find('a', offset) == -1:
+        res = "true"
+    else:
+        res = "false"
+    print("%s -> %s" % 
+             ( str, res )
+    )
+
+if __name__ == "__main__":
+    str = "aabb"
+    out(str)
+
+    str = "abab"
+    out(str)
+
+    str = "aaa"
+    out(str)
+
+    str = "bbb"
+    out(str)