Word Unscrambler

Hello, I am new to C++ and programming in general and am having a problem with a word unscrambler I'm trying to code. I have two txt files, words.txt and wordlist.txt that contain the scrambled words and unscrambled words respectively. As a test, my scrambled word is tac and my wordlist contains: dog bark cat. It finds the right word, but it has trouble unscrambling it.

Code:

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

using namespace std;
int main()
{
        fstream list("wordlist.txt");
        fstream words("words.txt");
        string sWords, sList;
        getline(words, sWords);
        while(!list.eof())
        {
                getline(list,sList);
                if(sWords.length()==sList.length())
                {
                        for(int i=0; i<sWords.length();i++){
                                for(int k=0; k<sList.length();k++){
                                        if(sWords[i]==sList[k]){
                                                sWords[i]=sList[k];
                                        }
                                }
                        }
                }
                cout << sWords << endl;
                getline(words, sWords);
        }
        cin.get();
        return 0;
}

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My output is:

Code:

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tac
tac
tac
tac
... loops for a while >_>

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I've been trying for a long time and am wondering if someone could point me in the right direction. Thanks

Hint:
count the number of occurances of each letter in each word.