#include <stdio.h>

int main(void){
    int N,t;
    char S[200000];
    scanf("%d",&N);
    scanf("%s",&S);
    for(int i=0;i<N;i++){
        t = S[i] - 97;
        S[i] = 'z' - t;
        printf("%c",S[i]);
    }
}