#include <stdio.h>
int main()
{
    _Bool is_first = 1;
    _Bool word = 0;
    char A = 'A';
    char Z = 'Z';
    char a = 'a';
    char z = 'z';
    char zero = '0';
    char nine = '9';
    char lower_bound = '_';
    char read = ' ';
    long result = 0;
    while (1)
    {
        read = getchar();
        if (read == EOF)
        {
            printf("\n");
            break;
        }
        if (read == ' ')
        {
            is_first = 1;
            result += word;
            word = 0;
            continue;
        }
        if (is_first == 1 && (read == '_' || (read - a >= 0 && z - read >=0) || (read - A >=0 && Z - read >= 0)))
        {
            is_first = 0;
            word = 1;
        }
        else if (is_first == 0 && (read == '_' || (read - a >= 0 && z - read >=0) || (read - A >=0 && Z - read >= 0) ||
        (read - zero >= 0 && nine - read >= 0)))
            continue;
        else
        {
            word = 0;
            is_first = 0;
        }
    }
    printf ("ответ равен %ld\n", result);
}