if(!Array.prototype.pop){Array.prototype.pop=function(){var last;if(this.length){last=this[this.length- 1];this.length-=1;}
return last;};}
if(!Array.prototype.push){Array.prototype.push=function(){for(var i=0;i<arguments.length;++i){this[this.length]=arguments[i];}
return this.length;};}
if(!Array.prototype.shift){Array.prototype.shift=function(){var first;if(this.length){first=this[0];for(var i=0;i<this.length- 1;++i){this[i]=this[i+ 1];}
this.length-=1;}
return first;};}
if(!Array.prototype.unshift){Array.prototype.unshift=function(){if(arguments.length){var i,len=arguments.length;for(i=this.length+ len- 1;i>=len;--i){this[i]=this[i- len];}
for(i=0;i<len;++i){this[i]=arguments[i];}}
return this.length;};}
if(!Array.prototype.splice){Array.prototype.splice=function(index,howMany){var elements=[],removed=[],i;for(i=2;i<arguments.length;++i){elements.push(arguments[i]);}
for(i=index;(i<index+ howMany)&&(i<this.length);++i){removed.push(this[i]);}
for(i=index+ howMany;i<this.length;++i){this[i- howMany]=this[i];}
this.length-=removed.length;for(i=this.length+ elements.length- 1;i>=index+ elements.length;--i){this[i]=this[i- elements.length];}
for(i=0;i<elements.length;++i){this[index+ i]=elements[i];}
return removed;};}