#include<bits/stdc++.h>
using namespace std;
int main()
{
	string s,c,s1,s2,s21,s11;
	cin >> s;
	for( int i = 0;i < s.size(); i++)
	{
		if(s[i] >='a' && s[i] <= 'z')
		{
			s1 += s[i];
		}
		if(s[i] >= 'A' && s[i] <= 'Z')
		{
			s2 += s[i];
		}
		
	}
	for(int i = s2.size();i >= 0; i--)
	{
		s21 += s2[i];
	}
	s11 = s21 + s1;
	cout << s11;
	return 0;
}
/**************************************************************
	Problem: 1569
	User: linyuhang
	Language: C++
	Result: Wrong Answer
****************************************************************/