#include <stdio.h>
#include <stdlib.h>
char Buffer1[128];
char Buffer2[128];
int main()
{
    sscanf("Bomcat@NCCU","%[^@]@%s",Buffer1,Buffer2);
    printf("Hello world! %s at %s\n",Buffer1,Buffer2);
    while (1)
    {
        scanf("%[1-9]",Buffer1);
        printf("%s\n",Buffer1);
    }
    return 0;
}