@@ -0,0 +1,154 @@
+public String atFirst(String str) %7B%0A  if (str.length() == 0) return %22@@%22;%0A  else if (str.length() == 1) return str + %22@%22;%0A  return str.substring(0, 2);%0A%7D%0A

Create atFirst.java