diff --git a/zeta_cpp/completed/2744.cpp b/zeta_cpp/completed/2744.cpp
new file mode 100644
index 0000000..b9635d8
--- /dev/null
+++ b/zeta_cpp/completed/2744.cpp
@@ -0,0 +1,19 @@
+#include <iostream>
+
+using namespace std;
+
+int main() {
+    string s;
+    cin >> s;
+    for (int i = 0; i < s.length(); i++) {
+        char c = s[i];
+        if (65 <= c && c <= 90) {
+            s[i] += 32;
+        } else {
+            s[i] -= 32;
+        }
+    }
+    cout << s;
+
+    return 0;
+}
\ No newline at end of file
diff --git a/zeta_cpp/completed/2754.cpp b/zeta_cpp/completed/2754.cpp
new file mode 100644
index 0000000..437609a
--- /dev/null
+++ b/zeta_cpp/completed/2754.cpp
@@ -0,0 +1,42 @@
+#include <iostream>
+#include <iomanip>
+
+using namespace std;
+
+int main() {
+    string s;
+    cin >> s;
+    float v;
+    if (s == "A+") {
+        v = 4.3;
+    } else if (s == "A0") {
+        v = 4.0;
+    } else if (s == "A-") {
+        v = 3.7;
+    } else if (s == "B+") {
+        v = 3.3;
+    } else if (s == "B0") {
+        v = 3.0;
+    } else if (s == "B-") {
+        v = 2.7;
+    } else if (s == "C+") {
+        v = 2.3;
+    } else if (s == "C0") {
+        v = 2.0;
+    } else if (s == "C-") {
+        v = 1.7;
+    } else if (s == "D+") {
+        v = 1.3;
+    } else if (s == "D0") {
+        v = 1.0;
+    } else if (s == "D-") {
+        v = 0.7;
+    } else if (s == "F")
+        v = 0.0;
+    else {
+        v = 0.0;
+    }
+    cout << fixed << std::setprecision(1) << v;
+
+    return 0;
+}
\ No newline at end of file
diff --git a/zeta_python/completed/10699.py b/zeta_python/completed/10699.py
new file mode 100644
index 0000000..371f3ea
--- /dev/null
+++ b/zeta_python/completed/10699.py
@@ -0,0 +1,3 @@
+import datetime
+
+print(datetime.date.today().isoformat())
\ No newline at end of file
diff --git a/zeta_python/completed/2420.py b/zeta_python/completed/2420.py
new file mode 100644
index 0000000..3612ea3
--- /dev/null
+++ b/zeta_python/completed/2420.py
@@ -0,0 +1,2 @@
+A = list(map(int, input().split()))
+print(abs(A[0] - A[1]))