// Zadanie 9
function letters(word) {
    numberOfLetters = {};
    for (let i = 0; i<word.length; i++) {
        if (numberOfLetters[word[i]] == undefined) {
            numberOfLetters[word[i]] = 1;
        } else {
            numberOfLetters[word[i]] ++;
        }
    }
    return numberOfLetters;
}

let mojeSlowo = "Subaru";
console.log(letters(mojeSlowo));