Reading String of Varied Sizes // String Manipulation C++

Question

So I just started learning C++ and My professor briefly went over Address (&) and Dereference (*) Operators. I'm not fluent in C++ but i have been searching around for parts and using common knowledge to combine into this code. It fails to build so Please Help!

Assignment- Write a program that keeps reading in strings of varied sizes. If an input string has length greater than one store it in a vector. When an input string has length one (a single character) you will output the string stored in your vector that has the first letter matching the input character. Keep doing this while you read string "quit".

#include "stdafx.h"
#include <iostream>
#include <string>
#include <vector>

using namespace std;


int main()
{
    string input;
    char* output;
    vector<string> name;

    while (input != "quit") {
        cin >> input;

        if (input.length == 1) {
            for (int i = 0; i < name.size; i++) {

                output = &name[i].at(0);

                if (input == output) {
                    cout << name[i];
                }
            }
        }
        else {

            name.push_back(input);
        }
    }

    //system("pause");
    return 0;
}

Answer 1

#include "stdafx.h"
#include <iostream>
#include <string>
#include <vector>

using namespace std;

int main()
{
    string input;
    vector<string> name;

    cin >> input;

    while (input != "quit") {

        if (input.length() == 1) {

            for (int i = 0; i < name.size(); i++) {

                if (input[0] == name[i][0]) {
                    cout << name[i] <<endl; 
                }
            }
        }
        else {
            name.push_back(input);
        }
        cin >> input;
    }
    system("pause");
    return 0;
}