转来转去

#include<bits/stdc++.h>
using namespace std;
int main(){
    string s; cin >> s;
    int l = s.size();
    for(int i = 0;i < l - 1;i++){
        int k = (char)(s[i]);
        int k1 = (char)(s[i + 1]);
        cout << (char)(k + k1);
    }
    cout << (char)((int)s[0] + (int)s[l - 1]);
    return 0;
}