Add Perl and Python solutions to challenge 033

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diff --git a/challenge-033/paulo-custodio/python/ch-1.py b/challenge-033/paulo-custodio/python/ch-1.py
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+#!/usr/bin/python3
+
+# Challenge 033
+#
+# Task #1
+# Count Letters (A..Z)
+# Create a script that accepts one or more files specified on the command-line
+# and count the number of times letters appeared in the files.
+#
+# So with the following input file sample.txt
+#
+# The quick brown fox jumps over the lazy dog.
+# the script would display something like:
+#
+# a: 1
+# b: 1
+# c: 1
+# d: 1
+# e: 3
+# f: 1
+# g: 1
+# h: 2
+# i: 1
+# j: 1
+# k: 1
+# l: 1
+# m: 1
+# n: 1
+# o: 4
+# p: 1
+# q: 1
+# r: 2
+# s: 1
+# t: 2
+# u: 2
+# v: 1
+# w: 1
+# x: 1
+# y: 1
+# z: 1
+
+import fileinput
+import sys
+from collections import defaultdict
+
+# collect
+count = defaultdict(lambda: 0)
+for line in fileinput.input():
+    for c in line:
+        if c.isalpha():
+            count[c.lower()] += 1
+
+# output
+for key in sorted(count):
+    print(f"{key}: {count[key]}")
diff --git a/challenge-033/paulo-custodio/python/ch-2.py b/challenge-033/paulo-custodio/python/ch-2.py
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+#!/usr/bin/python3
+
+# Challenge 033
+#
+# Task #2
+# Formatted Multiplication Table
+# Write a script to print 11x11 multiplication table, only the top half triangle.
+#
+#   x|   1   2   3   4   5   6   7   8   9  10  11
+# ---+--------------------------------------------
+#   1|   1   2   3   4   5   6   7   8   9  10  11
+#   2|       4   6   8  10  12  14  16  18  20  22
+#   3|           9  12  15  18  21  24  27  30  33
+#   4|              16  20  24  28  32  36  40  44
+#   5|                  25  30  35  40  45  50  55
+#   6|                      36  42  48  54  60  66
+#   7|                          49  56  63  70  77
+#   8|                              64  72  80  88
+#   9|                                  81  90  99
+#  10|                                     100 110
+#  11|                                         121
+
+# print header
+print("  x|", end="")
+for col in range(1, 12):
+    print(f"{col:4d}", end="")
+print("")
+print("---+", "-"*(11*4), sep="")
+
+# print table
+for row in range(1, 12):
+    print(f"{row:3d}|", end="")
+    print(" "*(4*(row-1)), end="")
+    for col in range(row, 12):
+        print(f"{row*col:4d}", end="")
+    print("")