C++ :

#include "bits/stdc++.h"
using namespace std;
int main()
{
	string s;
	cin >> s;
	for(int i=s.size()-1;i>=0;--i)
	{
		if(isupper(s[i])) cout << s[i];
	}
	for(int i=0;i<s.size();++i)
	{
		if(islower(s[i])) cout << s[i];
	}
	return 0;
}