#include <cstdio>

using namespace std;

int main()
{
    FILE *fin, *fout;
    fin= fopen("cezar.in","r");
    fout= fopen("cezar.out","w");
    char c;
    c= fgetc(fin);
    while( c>96 && c<123 ) {
        if( c=='z' ) fputc( 'a', fout );
        else fputc(c+1, fout );
        c=fgetc(fin);
    }
    return 0;
}