C++ 代码
#include <iostream>
#include <string>
using namespace std;
int main(){
string ss;
getline(cin, ss);
string a;
int len = ss.size(); //len > 2
for(int i = 1; i < len; i ++){
cout << (char)(ss[i] + ss[i - 1]);
}
cout << (char)(ss[len - 1] + ss[0]) << endl;
return 0;
}