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

int main() {
	//load input string
	FILE *file = fopen("input", "r");
	if (file == NULL) {
		perror("main: error opening file.");
		return -1;
	}

	uint32_t ncount = 0;
	uint8_t two_repeating_check = 0;
	uint8_t two_separated_check = 0;
	char input[256];
	while (fgets(input, sizeof(input), file) != NULL) {
		
		//two letters repeating test
		two_repeating_check = 0;
		for (uint8_t i = 0; i < strlen(input) - 1; i++) {
			for (uint8_t j = i + 2; j < strlen(input) - 1; j++) {
				if (input[i] == input[j] && input[i+1] == input[j+1])
					two_repeating_check = 1;
			}
		}

		//two letters separated by one test
		two_separated_check = 0;
		for (uint8_t i = 0; i < strlen(input) - 1; i++) {
			if (input[i] == input[i+2])
				two_separated_check = 1;
		}

		if (two_repeating_check && two_separated_check)
			ncount++;
	}
	if (ferror(file)) {		
		perror("main: error reading file.");
		return -1;
	}

	printf("ncount: %i\n", ncount);
	return 0;
}