#include <iostream>
#include <string>
#include <cctype>
#include <map>
 
// utility function for converting a string to lower case.
std::string as_lower(const std::string& text)
{
    std::string result;
 
    for (auto letter : text)
        result += static_cast<char>(std::tolower(letter));
 
    return result;
}
 
int main()
{
    // a map is an associative container.  In this case a word whose type is 
    // std::string is associated with a count whose type is unsigned
    // http://w...content-available-to-author-only...s.com/reference/map/map/
    std::map<std::string, unsigned> words;
 
    // using the words["word"] notation will cause an entry to be created for
    // "word" if one doesn't already exist, with a count of 0.  Whether it did
    // or didn't exist prior to that call, a reference to the count will be
    // returned.
    // http://w...content-available-to-author-only...s.com/reference/map/map/operator%5B%5D/
 
    std::string word;
    while (std::cin >> word)        // while a word is succesfully extracted,
        words[as_lower(word)]++;    // increase the count associated with it.
 
 
    // print the words and associated counts:
    for (auto& w : words)
        std::cout << '"' << w.first << "\": " << w.second << '\n';
}

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I ate a pie
It was a blueberry pie
I really like pie
Pie is good
I like good pie