diff --git a/code_study/Baekjoon/c/2744.c b/code_study/Baekjoon/c/2744.c
new file mode 100644
index 0000000..c38dfd9
--- /dev/null
+++ b/code_study/Baekjoon/c/2744.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+int main() {
+    char str[101];
+    scanf("%s",str);
+
+    int idx = 0;
+    while(str[idx] != '\0') {
+        if('A' <= str[idx] && str[idx] <= 'Z') str[idx++] += 32;
+        else if('a' <= str[idx] && str[idx] <= 'z') str[idx++] -= 32;
+    }
+
+    printf("%s\n",str);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/python/2744.py b/code_study/Baekjoon/python/2744.py
new file mode 100644
index 0000000..952285d
--- /dev/null
+++ b/code_study/Baekjoon/python/2744.py
@@ -0,0 +1,2 @@
+print(''.join([(lambda c: c.upper())(c) if c.islower() else c.lower() for c in input()]))
+#print(input().swapcase())
\ No newline at end of file
diff --git a/code_study/Baekjoon/swift/2744.swift b/code_study/Baekjoon/swift/2744.swift
new file mode 100644
index 0000000..9299c80
--- /dev/null
+++ b/code_study/Baekjoon/swift/2744.swift
@@ -0,0 +1,12 @@
+if let str = readLine() {
+    let result = str.map { c in
+        if c.isUppercase {
+            return c.lowercased()
+        }
+        else {
+            return c.uppercased()
+        }
+    }.joined()
+    
+    print(result)
+}