diff --git a/cpp/2204/220421-CN.cpp b/cpp/2204/220421-CN.cpp
new file mode 100644
index 0000000..eca73aa
--- /dev/null
+++ b/cpp/2204/220421-CN.cpp
@@ -0,0 +1,47 @@
+#include <cctype>
+#include <string>
+#include <sstream>
+#include <iostream>
+
+/**
+ * 824. Goat Latin
+ * You are given a string sentence that consist of words separated by spaces. Each word consists of lowercase and uppercase letters only.
+ *
+ * We would like to convert the sentence to "Goat Latin" (a made-up language similar to Pig Latin.) The rules of Goat Latin are as follows:
+ *
+ * If a word begins with a vowel ('a', 'e', 'i', 'o', or 'u'), append "ma" to the end of the word.
+ * For example, the word "apple" becomes "applema".
+ * If a word begins with a consonant (i.e., not a vowel), remove the first letter and append it to the end, then add "ma".
+ * For example, the word "goat" becomes "oatgma".
+ * Add one letter 'a' to the end of each word per its word index in the sentence, starting with 1.
+ * For example, the first word gets "a" added to the end, the second word gets "aa" added to the end, and so on.
+ * Return the final sentence representing the conversion from sentence to Goat Latin.
+ */
+
+class Solution {
+public:
+	static std::string toGoatLatin(const std::string& sentence) {
+		const std::string vowels = "aeiou";
+		std::istringstream sin(sentence);
+		std::string ret, word;
+		int cnt = 0;
+		while (sin >> word) {
+			if (std::string::npos == vowels.find(char(std::tolower(word.front())))) {
+				char ch = word.front();
+				word = word.substr(1);
+				word.push_back(ch);
+			}
+			word += "ma";
+			word += std::string(++cnt, 'a');
+			if (!ret.empty())
+				ret.push_back(' ');
+			ret += word;
+		}
+		return ret;
+	}
+};
+
+int main() {
+	std::cout << Solution::toGoatLatin("I speak Goat Latin") << "\n";
+	return 0;
+}
diff --git a/cpp/2204/CMakeLists.txt b/cpp/2204/CMakeLists.txt
index 5260e36..5e03d09 100644
--- a/cpp/2204/CMakeLists.txt
+++ b/cpp/2204/CMakeLists.txt
@@ -3,4 +3,4 @@ PROJECT(2204)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2204 220420-CN.cpp)
+ADD_EXECUTABLE(2204 220421-CN.cpp)