#include <string>
#include <vector>
using namespace std;

int mod(int a, int b)
{
    if (a % b >= 0)
        return a % b;
    else
        return b + a % b;
}

int main()
{
    string alphabet = "abcdefghijklmnopqrstuvwxyz";
    string x;
    vector<int> nums;
    cin >> x;
    vector<int> arr(x.size());
    for (int i = 0; i < x.size(); i++)
    {
        nums.push_back(alphabet.find(x[i]));
    }
    if (x.size() != 1)
    {
        for (int i = 1; i < x.size(); i++)
        {
            arr[i] = mod(nums[i] - nums[i - 1], 26);
        }
        arr[0] = mod(nums[0] - 5, 26);
        for (int i = 0; i < arr.size(); i++)
            cout << alphabet[arr[i]];
    }
    else
    {
        cout << alphabet[mod(nums[0] - 5, 26)] << endl;
    }
    return 0;
}