C++ :

#include <cstdio>
int main(){
    char c[8]; if(scanf("%s", c) != 1) return 0;
    for(char x=c[0]; x>='A'; x--) putchar(x);
    for(char x='A'+1; x<=c[0]; x++) putchar(x);
    putchar('\n');
    return 0;
}