#include <algorithm>
#include <cmath>
#include <cstring>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <iterator>

//#define pb push_back
#define puts(x) cout << #x << " : " << x << endl;
//#pragma GCC diagnostic ignored "-Wconversion"
//#define REP(i,n) for (int i=0;i<(n);i++)
//#define REPE(i,n) for (int i=0;i<=(n);i++)
//#define init(a,b) memset((a), (b), (sizeof(a)));
//#define PI 3.14159265
//#define EPS (1e-10)
//#define EQ(a,b) (abs((a)-(b)) < EPS)

using namespace std;

//const int INF = 1000*1000;

typedef long long ll;
//#define int long long

int dxy[] = {0, 1, 0, -1, 0};

typedef pair<int, int> P;

signed main() {
    string s;cin>>s;
    for(int i=0;i<s.size();i++){
        int minus = (i + 1) % 26;
        char c = s[i] - minus;
        if(c < 'A') c+= 26;
        s[i] = c;
    }
    cout<<s<<endl;
    return 0;
}