#include <stdio.h>

int is_hex_digit(char input)
{
    if((input>='0'&&input<='9')||(input>='a'&&input<='z')||(input>='A'&&input<='F'))
    {
        return 1;
    }
    else
    {
        return 0;
    }
    
}

int main(void)
{
    char input;
    printf("> ");
    scanf(" %c",&input);
    
    int output = is_hex_digit(input);
    
    printf("%d",output);
    
    return 0;
}