diff --git a/task1.cpp b/task1.cpp
new file mode 100644
index 0000000..f921a22
--- /dev/null
+++ b/task1.cpp
@@ -0,0 +1,20 @@
+#include <iostream>
+using namespace std;
+
+int main() {
+    int n;
+    cout << "Enter a four-digit number: ";
+    cin >> n;
+
+    if (n < 1000 || n > 9999) {
+        cout << "Error! This is not a four-digit number." << endl;
+    } else {
+        int a = n / 1000;
+        int b = (n / 100) % 10;
+        int c = (n / 10) % 10;
+        int d = n % 10;
+        int r = c * 1000 + d * 100 + a * 10 + b;
+        cout << "Result: " << r << endl;
+    }
+    return 0;
+}