class Keygen {
public static void main
(String[] args
) { System.
out.
println("hello world"); }
}
CgpjbGFzcyBLZXlnZW4gewogICAgcHVibGljIHN0YXRpYyB2b2lkIG1haW4oU3RyaW5nW10gYXJncykgewogICAgICAgIFN5c3RlbS5vdXQucHJpbnRsbigiaGVsbG8gd29ybGQiKTsKICAgIH0KfQ==