function reverseString(username) {
    let user = username[0];
    let user2 = user.split("").reverse().join("");;
    let counter = 0;

    while (true){
        let pass = username[0];
        if (pass === user2){
            console.log(`User ${user} logged in.`);
            break;
        } else {
            console.log("Incorrect password. Try again.");
            counter++;
        }

        if (counter >= 3){
            console.log(`User ${user} blocked!`);
            break;
        }
    }

}
reverseString(['Acer','login','go','let me in','recA']);