function encodeString(input) {
    let encodedString = '';
    let count = 1;
    
    for (let i = 0; i < input.length; i++) {
        if (input[i] === input[i + 1]) {
            count++;
        } else {
            encodedString += (count > 1 ? count : '') + input[i];
            count = 1;
        }
    }
    
    return encodedString;
}

document.getElementById('encodeButton').addEventListener('click', function() {
    let inputString = document.getElementById('inputString').value;
    let encodedString = encodeString(inputString);
    document.getElementById('outputString').textContent = encodedString;
});