(function(){function d(a){this.c=false;this.value=a}function i(a){this.value=a}function h(a){if(a==null)return[];else if(a instanceof e)if(typeof a.a=="string"){for(var b="";a instanceof e;){b+=a.a;a=c(a.b)}return b}else{for(b=[];a instanceof e;){b.push(h(a.a));a=c(a.b)}return b}else return typeof a=="function"?function(){for(var f=a,j=arguments.length,g=0;g<j;g++){if(typeof f!="function")throw"Wrong number of arguments for callback: "+arguments.toString();f=f(arguments[g])}return c(f)}:a}function e(a,
b){this.a=a;this.b=b}function c(a,b){for(;a instanceof d;)a=a.d(b);return a}d.prototype.d=function(a){return a?this.value():this.c?this.value:(this.c=true,this.value=this.value())};function k(a){return new d(function(){var b=window.alert(h(c(a)));return new i(b)})}c(new d(function(){for(var a=null,b=12;b>=0;b--)a=new e("Hello, World!"[b],a);return k(a)}),true)})();