AssArrExercise

function solve(str) {
    str = str.split(' ');

    let wordsMap = new Map();

    for(let word of str) {
        word = word.toLowerCase();
        if(wordsMap.has(word)) {
            let count = wordsMap.get(word);
            count++;
            wordsMap.set(word, count);
        } else {
            wordsMap.set(word, 1);
        }
    }

    let entries = Array.from(wordsMap.entries());
    let filteredEntries = entries.filter(word => {
        return word[1] % 2 !== 0;
    });

    let resultArr = [];

    filteredEntries.forEach(entrie => {
        resultArr.push(entrie[0]);
    });

    console.log(resultArr.join(' '));
}