#include<stdio.h>
main(){
    char S[1025];
    char ans[1025];
    scanf("%s",S);
    for(int i = 0;;i++){
        if(S[i] == '\0'){
            ans[i] = '\0';
            break;
        }
        ans[i] = S[i] - (i%26+1);
        if(ans[i] < 'A'){ans[i] += 26;}
    }
    printf("%s\n",ans);
}