pbinfo #1000 CNP

#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("cnp.in");
ofstream fout("cnp.out");
char cuvant[2000];
char CNP[2000],aux[1];
bool ok;
int main()
{
    while(!fin.eof())
    {

        fin.get(cuvant,200);
        fin.get();
        int i = 0;
        while(i < strlen(cuvant))
        {
            while(isdigit(cuvant[i]))
            {
                aux[0]=cuvant[i];
                strcat(CNP, aux);
                i++;
            }
            if(strlen(CNP)==13)
                fout << CNP << endl,
                ok = true;
            strcpy(CNP,"");
            i++;
        }
    }
    if(!ok)
        fout << 0;
}