new str

#include <iostream>
#include <string>
#include <fstream>
using namespace std;
int main()
{
    string str, s, g;
    ifstream in ("input.txt");
    /*char c;*/
    cout << "Enter letter ";
    cin >> g;
    while (in.peek()!=EOF)
    {
        in >> str;
        if (( str[0] == g[0]) && (str[str.length()] == g[0]))
            s += str + " ";

    }
    cout << s;
    in.close();

    return 0;
}