list №9

#include <iostream>
#include <list>

using namespace std;

int main()
{
    list<char> l;
    list<char>::iterator it;

    char c;
    while (cin >> c) {
        if (c == '.') {
            break;
        }
        else {
            l.push_back(c);
        }
    }

    it = l.begin();
    while (it != l.end())
        {
        if (*it == '#')
        {
            it = l.erase(it);
            if (it != l.begin())
            {
                it--;
                it = l.erase(it);
                if (it != l.begin())
                {
                    it--;
                }
            }
        }
        else {
            it++;
        }
    }

    for (it = l.begin(); it != l.end(); it++) {
        cout << *it;
    }
}

/**
#######1#23##HE345###LL06783####
**/