#include<iostream>

#include<stack>

using namespace std;

int main(){

    stack<int>mystack1;
    stack<int>mystack2;

    //pushing elements into first stack

    mystack1.push(27);
    mystack1.push(29);
    mystack1.push(28);
    
    //pushing elements into second stack

    mystack2.push(34);
    mystack2.push(33);
    mystack2.push(35);

    //using swap functions

    mystack1.swap(mystack2);
    
// printing the first stack

    cout<<"mystack1=";
    while(!mystack1.empty()){
        cout<<mystack1.top()<<" ";
        mystack1.pop();
    }

// printing the second stack

    cout<<endl<<"mystack2= ";
    while(!mystack2.empty()){
        cout<<mystack2.top()<<" ";
        mystack2.pop();

    }
     return 0;

}