#include <ctype.h>
#include <stdio.h>

int main() {
    char a;
    while (scanf("%c", &a) != EOF) { // 注意 while 处理多个 case
        // 64 位输出请用 printf("%lld") to 
        getchar();
        if(isalpha(a))
        {
            printf("%c is an alphabet.\n",a);
        }
        else {
            printf("%c is not an alphabet.\n",a);
        }
    }
    return 0;
}