#include <stdio.h>
#include <locale.h>

struct list
{
    char elem;
    list* next;
    list* prev;
};

void read(FILE* f, list** p)
{
    char c = getc(f);
    if (c != '.')
    {
        list* ph = new list;
        *p = ph;
        ph->elem = c;
        ph->next = ph;
        ph->prev = ph;
        c = getc(f);
        while (c != '.')
        {
            ph->next = new list;
            ph->next->prev = ph;
            ph = ph->next;
            ph->elem = c;
            ph->next = *p;
            (*p)->prev = ph;
            c = getc(f);
        }
    }
}

int result(list* ph)
{
    int res = 0;
    list* p = ph;
    do
    {
        if (ph->elem == ph->next->elem)
            res = 1;
        ph = ph->next;

    } while (ph != p && res != 1);
    return res;
}

int main()
{

    int i = 0;
    list* p = NULL;

    FILE* f;

    if (!(fopen_s(&f, "file1.txt", "r")))
        read(f, &p);
    else
        printf_s("Не найден файл");

    i = result(p);
    printf_s("%d", i);
}