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

int read_text(char str[], int size, int flag);

int main(void)
{
	char ch, str[100];
	int i, len;

	do
	{
		printf("Enter text (more than 2 chars): ");
		len = read_text(str, sizeof(str), 1);
	} while(len < 3);

	printf("Enter character: ");
	ch = getchar();

	for(i = 0; i <= len-3; i++)
		if(str[i] == ch && str[i+1] == ch && str[i+2] == ch)
		{
			printf("There are three successive '%c's in position %d\n", ch, i+1);
			return 0;
		}
	printf("There aren't three successive '%c's\n", ch);
	return 0;
}

int read_text(char str[], int size, int flag)
{
    int len;

    if(fgets(str, size, stdin) == NULL)
    {
        printf("Error: fgets() failed\n");
        exit(EXIT_FAILURE);
    }

    len = strlen(str);
    if(len > 0)
    {
        if(flag && (str[len - 1] == '\n'))
        {
            str[len - 1] = '\0';
            len--;
        }
    }
    else
    {
        printf("Error: No input\n");
        exit(EXIT_FAILURE);
    }

    return len;
}