#include <bits/stdc++.h>
#define  Rep(i,j,n) for(li i=(j);i<(n);i++)
#define  rep(i,n) Rep(i,0,(n))
#define  all(a) begin(a),end(a)
using namespace std;
typedef long int li;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef vector<string> vs;
 
int main()
{
    string s;
    cin>>s;
    rep(i,s.size()){
        s[i]-=(i+1)%26;
        if(s[i]<'A')s[i]+=26;
    }
    cout<<s<<endl;
    return 0;
}