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#include<iostream>

#include<stack>

using namespace std;

//elements are printed and then pushed back to maintain same order

//it has extra time complexity due to recursion call stack

void displayRecur(stack<int>& st){

if(st.size()==0) return;

cout<<st.top()<<endl;

int x = st.top();

st.pop();

displayRecur(st);

st.push(x);

}

void displayRev(stack<int>& st){

if(st.size()==0) return;

int x = st.top();

st.pop();

displayRev(st);

cout<<x<<" ";

st.push(x);

}

int main(){

stack<int> st;

st.push(50);

st.push(40);

st.push(30);

st.push(20);

st.push(10);

displayRev(st);

}