2 files changed, 59 insertions, 0 deletions
diff --git a/challenge-255/lubos-kolouch/python/ch-1.py b/challenge-255/lubos-kolouch/python/ch-1.py
new file mode 100644
index 0000000000..b09f8ab050
--- /dev/null
+++ b/challenge-255/lubos-kolouch/python/ch-1.py
@@ -0,0 +1,24 @@
+def find_odd_character(s: str, t: str) -> str:
+    """
+    Finds the additional character in string t.
+
+    :param s: Original string.
+    :param t: Modified string with one extra character.
+    :return: The additional character.
+    """
+    from collections import Counter
+
+    count_s = Counter(s)
+    count_t = Counter(t)
+
+    for char in count_t:
+        if count_t[char] > count_s.get(char, 0):
+            return char
+
+    return ""
+
+
+# Tests
+assert find_odd_character("Perl", "Preel") == "e"
+assert find_odd_character("Weekly", "Weeakly") == "a"
+assert find_odd_character("Box", "Boxy") == "y"
diff --git a/challenge-255/lubos-kolouch/python/ch-2.py b/challenge-255/lubos-kolouch/python/ch-2.py
new file mode 100644
index 0000000000..2c2f1d6807
--- /dev/null
+++ b/challenge-255/lubos-kolouch/python/ch-2.py
@@ -0,0 +1,35 @@
+def most_frequent_word(p: str, w: str) -> str:
+    """
+    Find the most frequent word in a paragraph excluding a specific word.
+
+    :param p: Paragraph as a string.
+    :param w: Banned word.
+    :return: Most frequent word.
+    """
+    import re
+    from collections import Counter
+
+    # Clean and split the paragraph into words
+    words = re.findall(r"\w+", p.lower())
+
+    # Count the frequency of each word, excluding the banned word
+    word_count = Counter(words)
+    if w in word_count:
+        del word_count[w]
+
+    # Find the most frequent word
+    most_frequent = word_count.most_common(1)[0][0]
+
+    return most_frequent
+
+
+# Test cases
+print(
+    most_frequent_word("Joe hit a ball, the hit ball flew far after it was hit.", "hit")
+)
+print(
+    most_frequent_word(
+        "Perl and Raku belong to the same family. Perl is the most popular language in the weekly challenge.",
+        "the",
+    )
+)