#include<stdio.h>
int main ()
{
    char ch;
    scanf("%c",&ch);

    if (ch>='a'&&ch<='z'|| ch>='A'&&ch<='Z')
        printf("it is an alphabet\n");
    else if (ch>='0' && ch<='9')
        printf("it is a digit\n");
    else
        printf("it is a special character\n");

    return 0;
}