wda

#include <iostream>
#include <string>
#include <vector>
using namespace std;
int main() {
    string s;
    cin >> s;
    vector <int> a(26);
    a[0]=1;
    a[1]=1;
    for (int i = 2; i<26; i++) {
        a[i]=a[i-2]+a[i-1];
    }
    for (int i = 0; i<s.size(); i++) {
        for (int j = 0; j<26; j++) {
            if (i+1==a[j]) {
                cout << s[i];
                break;
            }
        }
    }
}