diff --git a/LibreOJ/3/3.go b/LibreOJ/3/3.go
new file mode 100644
index 00000000..6c519416
--- /dev/null
+++ b/LibreOJ/3/3.go
@@ -0,0 +1,20 @@
+package main
+
+import (
+    "bufio"
+    "os"
+)
+
+func main() {
+    file, _ := os.Open("copycat.in")
+    out, _ := os.OpenFile("copycat.out", os.O_WRONLY|os.O_CREATE, 0644)
+    reader := bufio.NewReader(file)
+    writer := bufio.NewWriter(out)
+
+    x, e := reader.ReadString('\n')
+    for e == nil {
+        x, e = reader.ReadString('\n')
+        writer.WriteString(x)
+    }
+    writer.Flush()
+}