#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<math.h>

typedef long long int ll;

ll MAX(ll a, ll b){return a>b?a:b;}
ll MIN(ll a, ll b){return a>b?b:a;}
int compare(const void* a, const void* b){return *(int*)a - *(int*)b;}
ll digits(ll a){ll tmp=a; ll cnt=0; while(tmp>0){tmp/=10; cnt+=1;} return cnt;}


int main(void){
    char s[1025];
    scanf("%s", s);

    int s_len = strlen(s);

    for(int i=0; i<s_len; i++){
        int step = (s[i]-'A') - (i+1)%26;

        if(step >= 0){
            putchar('A'+step);
        }else{
            putchar('A'+step+26);
        }
    }

    printf("\n");

}