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+#!/usr/bin/env python3
+
+# Challenge 060
+#
+# TASK #2 > Find Numbers
+# Reviewed by: Ryan Thompson
+# Write a script that accepts list of positive numbers (@L) and two positive
+# numbers $X and $Y.
+#
+# The script should print all possible numbers made by concatenating the numbers
+# from @L, whose length is exactly $X but value is less than $Y.
+#
+# Example
+# Input:
+#
+# @L = (0, 1, 2, 5);
+# $X = 2;
+# $Y = 21;
+# Output:
+#
+# 10, 11, 12, 15, 20
+
+import sys
+
+def combine1(combin, prefix, n, digits):
+    if len(prefix) == n:
+        num = int(prefix)
+        if not num in combin:
+            combin.add(num)
+    else:
+        for digit in digits:
+            combine1(combin, prefix+digit, n, digits)
+
+def combine(digits):
+    combin = set()
+    for n in range(1, len(digits)+1):
+        combine1(combin, "", n, digits)
+    nums = sorted(list(combin))
+    return nums
+
+def numbers(X, Y, L):
+    nums = combine(L)
+    nums = list(filter(lambda x:len(str(x))==X and x<Y, nums))
+    return nums
+
+X = int(sys.argv[1])
+Y = int(sys.argv[2])
+L = sys.argv[3:]
+nums = numbers(X, Y, L)
+print(", ".join(map(str, nums)))