сэйв

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

void main()
{
    string line;
    ifstream Fin; // поток ввода
    ofstream Fout; // поток вывода
    Fin.open("C:\\Users\\User\\Desktop\\text.txt");
    Fout.open("C:\\Users\\User\\Desktop\\OutputText.txt");
    char symbol = 'а';
    int withoutThatSymbol = 0, currentPosition;

    while (getline(Fin, line))
    {
        currentPosition = 0;
        withoutThatSymbol++;
        while (line[currentPosition] == ' ' && line[currentPosition] != '\0')
            currentPosition++; //Проходит пробелы в начале строки
        while (line[currentPosition] != '\0')
        {
            if (line[currentPosition] == symbol)
            {
                withoutThatSymbol--;
                break;
            }
            currentPosition++;
        }
    }
    Fout << withoutThatSymbol << endl;
    cout << withoutThatSymbol << endl;
    Fin.close();
    Fout.close();
    cin.get(); cin.get();
}