#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <search.h>

static void *root;

static int cmp(const void *a, const void *b) {
	return strcmp(a, b);
}

static char *sdup(char *s) {
	size_t n = strlen(s)+1;
	return memcpy(malloc(n), s, n);
}

static int add(char *s) {
	char **r = tsearch(s, &root, cmp);
	if (*r == s) {
		/* only do the string copy if s is a new string */
		*r = sdup(s);
		return 1;
	}
	return 0;
}

static int getword(char *s) {
	int c;

	for (;;) {
		c = getchar();
		if (c == EOF)
			return 0;
		if (!(c == ' ' || c == '\n' || c == '\r' || c == '\t'))
			break;
	}
	for (;;) {
		*s++ = c;
		c = getchar();
		if (c == EOF || c == ' ' || c == '\n' || c == '\r' || c == '\t')
			break;
	}
	*s = 0;
	return 1;
}

int main(void) {
	char buf[4096];
	int c = 0;

	while (getword(buf))
		c += add(buf);
	printf("%d\n", c);
	return 0;
}