#include <stdio.h>
#include <stdlib.h>
#define MAXLEN 10000

int getline(char line[], int limit);
void copy(char from[], char to[]);

int main()
{
    int len; // длина текущей строки
    int threshold = 7; // порог > 80 символов
    char line[MAXLEN];
    while (1)
    {
        len = getline(line, MAXLEN);
        if (len > threshold)
            printf("%s", line);
    }

    return 0;
}

int getline(char line[], int limit)
{
    int c, i;
    for(i = 0; i < limit && (c = getchar()) != EOF && c != '\n'; ++i)
        line[i] = c;
    if (c == '\n') {
        line[i] = c;
        ++i;
    }
    line[i] = '\0';
    return i;
}

void copy(char from[], char to[])
{
    int i = 0;
    while ((to[i] = from[i]) != '\0')
        ++i;
}