Sorting vectors with upper and lowercase letters

So I have a program that reads through a file and gets the largest words by using a map with an int as the key and a vector as value. I need to print out the largest words but have a problem with the sorting. Whereas the output should be Copyright, Publishin, Universal, blueprint I get :blueprint, Copyright, Universal, Publishin

How can I fix this? Do vectors not sort uppercase AND lowercase? Here's what I have so far:

string temp;
stringstream ss(line);
while(ss >> temp){
    int wordlength = temp.length();
    wordit = wordbycount.find(wordlength);
    if(wordit != wordbycount.end()){                 
    vector<string> arrayofLongest= wordit->second; 
    std::vector<string>::iterator iterator1 = find(arrayofLongest.begin(),      arrayofLongest.end(), temp);

    if(iterator1 == arrayofLongest.end())  
    {wordit->second.push_back(temp);} }

    else{
               wordbycount[wordlength] = {temp};
               }          } }