#include<bits/stdc++.h>
typedef long long ll;
typedef unsigned long long ull;
using namespace std;
#define pb push_back
int dy[]={0, 0, 1, -1, 1, 1, -1, -1};
int dx[]={1, -1, 0, 0, 1, -1, -1, 1};

#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
#define mp make_pair
#define fi first
#define sc second

int main(){
    char s[2000];
    scanf("%s",s);

    int n = strlen(s);

    REP(i,n){
        int j = i % 26;
        s[i] = ((s[i] - 'A') - j - 1 + 26) % 26 + 'A';
        printf("%c",s[i]);
    }
    printf("\n");
    return 0;
}