function maxNumber(input) {

    let i = 0;
    let currentNumber = input[i];
    let previousNumber = 0;

    while (currentNumber !== "Stop") {
        currentNumber = Number(input[i]);

        if (previousNumber <= currentNumber) {
            previousNumber = currentNumber
        }
        i++;
        currentNumber = input[i];
    }
        console.log(previousNumber);
}