PrVecList1A

#include <iostream>
#include <fstream>
#include <list>

using namespace std;

int main (void)
{
    ifstream in("input.txt");

    list <int> ls;
    list <int>::iterator i;
    int a;
    bool b = true;
    while (in >> a)
    {
        ls.push_back(a);
    }

    for (i = ls.begin(); i != ls.end();)
    {
        a = *i;
        if (a % 3 == 0)
        {
            i = ls.erase(i);
            b = false;
            break;
        }
        else i++;
    }

    if (b == false)
        for (i = ls.begin(); i != ls.end(); i++)
            cout << *i << " ";
    else cout << "No elem" << endl;

    return 0;
}