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

int main(void) {
	FILE *fp;
	char* line = NULL;
	size_t len = 0;
	int valid = 0;

	fp = fopen("input", "r");
	
	while(getline(&line, &len, fp) != -1) {
		int start, end;
		char subject;
		char* password;

		sscanf(line, "%d-%d %c: %s\n", &start, &end, &subject, password);
	
		if(password[start - 1] == subject && password[end - 1] != subject ||
			password[end - 1] == subject && password[start - 1] != subject)
			valid++;
	}

	fclose(fp);

	printf("There are %d valid passwords\n", valid);
}