готово)

#include <iostream>
#include <string>
#include <fstream>

using namespace std;
int main()
{
	ifstream in("Input.txt");
	ofstream out("Output.txt");
	string s;
	int min, row, i = 1;
	min = 10;
	while (in.peek() != EOF)
	{
		in >> s;
		int count = s.size();
		if (count < min)
		{
			min = count;
			row = i;
		}
		++i;
	}
	out << row << endl;
	in.close();
	out.close();
	return 0;
}