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+#!/usr/bin/env python3
+
+# Challenge 146
+#
+# Consider the following Curious Fraction Tree:
+#
+#
+# Curious Fraction Tree
+#
+#
+# You are given a fraction, member of the tree created similar to the above sample.
+#
+# Write a script to find out the parent and grandparent of the given member.
+#
+# Example 1:
+#     Input: $member = '3/5';
+#     Output: parent = '3/2' and grandparent = '1/2'
+# Example 2:
+#     Input: $member = '4/3';
+#     Output: parent = '1/3' and grandparent = '1/2'
+#
+# Solution:
+# for node a/b, the children are a/(a+b) and (a+b)/b
+
+import sys
+
+def parent(a, b):
+    if a / b < 1:  # a/(a+b)
+        parent_a = a
+        parent_b = abs(b - a)
+    else:  # (a+b)/b
+        parent_a = abs(b - a)
+        parent_b = b
+    return parent_a, parent_b
+
+input_value = sys.argv[1]
+a, b = map(int, input_value.split('/'))
+print(f"{a}/{b} -> ", end="")
+a, b = parent(a, b)
+print(f"{a}/{b} -> ", end="")
+a, b = parent(a, b)
+print(f"{a}/{b}")