import java.util.*;
import java.lang.*;
class Main
{
{
System.
out.
println(reverse
(ab
));
}
if (s.length() <= 1) {
return s;
}
return reverse(s.substring(1, s.length())) + s.charAt(0);
}
}
aW1wb3J0IGphdmEudXRpbC4qOwppbXBvcnQgamF2YS5sYW5nLio7CgpjbGFzcyBNYWluCnsKCXB1YmxpYyBzdGF0aWMgdm9pZCBtYWluIChTdHJpbmdbXSBhcmdzKSB0aHJvd3MgamF2YS5sYW5nLkV4Y2VwdGlvbgoJewoJU3RyaW5nIGFiPSJhYmMiOwoJU3lzdGVtLm91dC5wcmludGxuKHJldmVyc2UoYWIpKTsKCgl9CgogICAgcHVibGljIFN0cmluZyByZXZlcnNlKFN0cmluZyBzKSB7CiAgICBpZiAocy5sZW5ndGgoKSA8PSAxKSB7IAogICAgICAgIHJldHVybiBzOwogICAgfQogICAgcmV0dXJuIHJldmVyc2Uocy5zdWJzdHJpbmcoMSwgcy5sZW5ndGgoKSkpICsgcy5jaGFyQXQoMCk7Cn0KCgoKCn0=