#include <bits/stdc++.h>
using namespace std;
int main(){
string str;
string str1;
getline(cin,str);//只读入一行,即不接收回车。可读入string
for(int i = 0;i<str.size();i++){
str1 += str[i] + str[(i+1)%str.size()];//字符串追加
}
cout<<str1<<endl;
return 0;
}