function solve() {

    function addInput() {
        let input = document.querySelector("#exercise > article > input[type=text]");
        if (input.value) {
            let rows = document.querySelectorAll("#exercise > div > ol > li");
            let index = 0;
            for (let i = 97; i <= 122; i++) {
                if (String.fromCharCode(i) === input.value.charAt(0).toLowerCase()) {
                    // debugger;
                    if (rows[index].textContent === "") {
                        rows[index].textContent += getName(input.value);
                    } else {
                        rows[index].textContent += ", " + getName(input.value);
                    }
                }
                index++;
            }
            input.value = null;
        }
    }

    function getName(inputName) {
        let currentName = "";
        currentName += inputName[0].toUpperCase();

        for (let i = 1; i < inputName.length; i++) {
            currentName += inputName[i].toLowerCase();
        }
        return currentName;
    }

    document.querySelector("#exercise > article > button").addEventListener('click', addInput);

}