#include<iostream>
#include<cmath>
#include<cstdio>
#include<algorithm> 
#include<cstring>
#include<string>
using namespace std;
int main(){
	string s;
	cin >> s;
	string s1 = "";
	for(int i=1;i<s.length();i++){
		s1 += s[i] + s[i-1];
	} 
	s1+=s[s.length()-1] + s[0];
	cout << s1;
	return 0;
}