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+#!/usr/bin/env python3
+
+# Challenge 056
+#
+# TASK #1
+# Diff-K
+# You are given an array @N of positive integers (sorted) and another non
+# negative integer k.
+#
+# Write a script to find if there exists 2 indices i and j such that
+# A[i] - A[j] = k and i != j.
+#
+# It should print the pairs of indices, if any such pairs exist.
+#
+# Example:
+#
+#     @N = (2, 7, 9)
+#     $k = 2
+# Output : 2,1
+
+import sys
+
+k = int(sys.argv[1])
+n = [int(x) for x in sys.argv[2:]]
+
+for i in range(0, len(n)-1):
+    for j in range(i+1, len(n)):
+        if abs(n[i]-n[j]) == k:
+            print(str(i)+","+str(j))