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

int main() {
	vector<int> vec { 1, 2, 3, 4};
	reverse(vec.begin(), vec.begin()+2);
	for(int i = 0; i< vec.size();i++)
	    cout<<vec[i]<<"\n";
	// your code goes here
	return 0;
}