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

char *scan_sentence() {
    char *s = malloc(10 * sizeof(char));
    int counter = 0;
    int size = 10;
    char current_symbol;
    current_symbol = getchar();
    while ((current_symbol == ' ') || (current_symbol == '\t')) {
        current_symbol = getchar();
    }
    while ((current_symbol != '\n') && (current_symbol != ';') && (current_symbol != '.') && (current_symbol != '?') &&
           (current_symbol != '!')) {
        if (counter >= size - 5) {
            size += 20;
            s = realloc(s, size);
        }
        s[counter] = current_symbol;
        counter++;
        current_symbol = getchar();
    }
    s[counter++] = current_symbol;
    s[counter++] = '\n';
    s[counter] = '\0';
    return s;
}

int lucky_seven(const char *s) {
    for (int i = 0; i < strlen(s); i++) {
        if (s[i] == '7') {
            return 1;
        }
    }
    return 0;
}

int main() {
    char **arr = malloc(10 * sizeof(char *));
    int counter = 0;
    int size = 10;
    char *s;
    do {
        s = scan_sentence();
        if (counter == size - 1) {
            size += 10;
            arr = realloc(arr, size * sizeof(char *));
        }
        arr[counter] = s;
        counter++;
    } while (strcmp(s, "Dragon flew away!\n") != 0);
    int count_1 = counter;
    int prover = 0;
    while (prover < counter) {
        if (lucky_seven(arr[prover]) == 1) {
            free(arr[prover]);
            for (int i = prover + 1; i < counter; i++) {
                arr[i - 1] = arr[i];
            }
            counter--;
        } else {
            prover++;
        }
    }
    for (int i = 0; i < counter; i++) {
        fputs(arr[i], stdout);
    }
    int count_2 = counter;
    printf("Количество предложений до %d и количество предложений после %d", count_1-1, count_2);
    for (int i = 0; i < counter; i++) {
        free(arr[i]);
    }
    free(arr);
}