#include <iostream>
#include <vector>
using namespace std;

// Function to Display Vector
void dispVector(vector<int> A)
{
 vector<int>::iterator it;

 for(it=A.begin();it!=A.end();it++)
  cout<<*it<<" ";
  cout<<"\n";
}
// Main Function
int main() {

 //Declaring a vector of size 4 and initialising to zero
 vector<int> A(4,0);
 int i;

 // Calling Display function
 dispVector(A);

 // Taking input in vector
 cout<<"Enter 4 elements\n";
 for(i=0;i<4;i++)
  cin>>A[i];

 dispVector(A);
 //adding 5 at the end of vector
 cout<<"Adding 5 at the end\n";
 A.push_back(5);
 dispVector(A);
 cout<<"Size:"<<A.size()<<"\n";

 //Deleting last element from the vector
 cout<<"Deleting last element\n";
 A.pop_back();
 dispVector(A);
 cout<<"Size:"<<A.size()<<"\n";

 //Inserting 8 at index 2
 cout<<"inserting 8 at index 2\n";
 A.insert(A.begin()+2,8);
 dispVector(A);

 //Deleting element at index 3
 cout<<"Deleting element at index 3\n";
 A.erase(A.begin()+3);
 dispVector(A);

 return 0;
}