nr care contin 7

#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream in("datein.txt");
    ofstream out("dateout.txt");
    int n;
    while (in >> n)
    {
        int p = n;
        int ok = 0;
        while (p)
        {
            if (p % 10 == 7)
                ok = 1;
            p /= 10;

        }
        if (ok==1)
            out << n << " ";
    }
    return 0;

}