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

struct problem_1089
{
    char word[10];
    int len;
};

problem_1089 slovar[100] = {};
int n = 0;
bool flag = false;
char c;
char str[1001] = {};
int len = 0;
int count = 0;

void check()
{
    for (int i = 0; i < n; i++)
    {
        if (slovar[i].len == len)
        {
            int error = 0;
            for (int j = 0; j < len; j++)
            {
                if (str[j] != slovar[i].word[j]) error++;
                if (error > 1) break;
            }
            if (error == 1)
            {
                strcpy (str,slovar[i].word);
                count++;
                return;
            }
        }
    }
    return;
}

int main ()
{
    //freopen ("input.txt","r",stdin);
    //freopen ("output.txt","w",stdout);
    while (!flag)
    {
        gets(slovar[n++].word);
        slovar[n - 1].len = strlen (slovar[n - 1].word);
        if (strcmp(slovar[n - 1].word,"#") == 0)
        {
            flag = true;
            slovar[--n].word[0] = '\0';
            slovar[n].len = 0;
        }
    }
    bool perevod = false;
    while (scanf ("%c", &c) != EOF)
    {
        flag = false;
        if (c > 96 && c < 123)
            str[len++] = c;
        else
        {
            check();
            for (int i = 0; i < len; i++) printf ("%c", str[i]);
            if (c == '\n') perevod = true;
            else perevod = false;
            printf ("%c", c);
            len = 0;
        }

    }
    if (len > 0) perevod = false;
    check();
    for (int i = 0; i < len; i++) printf ("%c", str[i]);
    if (!perevod && !flag) printf ("\n%d", count);
    else printf ("%d", count);
    return 0;
}

Hi,

There can be more than 100 words in the vocabulary so don't read just first 100 words instead just read everything till you encounter #

Varun