Create a new stack in which to put every third element of the first stack

[Aspasrelek]

Hello!
I need some help.
I have to do the following task:
Create a stack with numbers in the range from -50 to +50. After creating the stack, perform the following actions: create a new stack, in which every third element of the first stack will be placed. Upon completion, all stacks must be removed.

I was able to write the code of the program with creating a stack in the specified range, viewing and deleting it, but I can not implement the function to create the second stack.

#include "stdafx.h"
#include <iomanip>
#include <stack>
#include <iostream>
#include <ctime>
using namespace std;

struct Stack     
{ 
	int info; 
	int in;
	Stack *next; 
} *begin1, *second;  

Stack* InStack(Stack*, int);
void View(Stack*);
Stack* DelStackAll(Stack*);

int main()
{	srand(time(0));
	int i;  
	for(i=1; i<=10; i++)
	{
		begin1=InStack(begin1, rand()%101-50); 
	}
	View(begin1);
	
	begin1=DelStackAll(begin1);
	
	getchar();
}

Stack* InStack(Stack *p, int in){ 
	Stack *t=new Stack; 
	t->info=in;        
	t->next=p;          
	return t;
}

void View(Stack *p)    
{
	Stack *t=p;       
	while (t!=NULL) 
	{
		cout<<setw(5)<<t->info;   
		t=t->next;             
	}
	cout<<endl;
}

Stack* DelStackAll(Stack *p)
{ Stack *t; 
	while(p != NULL) {
		t=p;
		p=p->next;
		delete t;
	}
	return p;
}

I will be very grateful for the help!