строки 4 -6

#include <iostream>
#include <string>
using namespace std;
int main()
{
	string line;
	cout << "Enter numbers: ";
	getline(cin, line);
	 string::size_type k = 0, maxLine = 0, lineLen = line.length();
	for(unsigned int i = 0; i != lineLen; ++i)
   {
		if (isdigit(line[i]))
         ++k;
		else
      {
         if (k > maxLine)
            maxLine = k;
         k = 0;
      }
   }
	if (k > maxLine)
	maxLine = k;
	cout <<"Max Line: " << maxLine << endl;
	system ("pause");
	return 0;
}