function passwordValidator(input) {
    let usersPassword = input.shift();
    for (let element of input) {
        element = element.split(" ");
        let command = element[0];
        if (command == "Make" && element[1] == "Upper") {
            let index = Number(element[2]);
            let letter = usersPassword.charAt(index).toUpperCase();
            usersPassword = usersPassword.replace(usersPassword.charAt(index), letter);
            console.log(usersPassword);
        }
        if (command == "Make" && element[1] == "Lower") {
            let index = Number(element[2]);
            let letter = usersPassword.charAt(index).toLowerCase();
            usersPassword = usersPassword.replace(usersPassword.charAt(index), letter);
            console.log(usersPassword);
        }
        if (command == "Insert") {
            let index = Number(element[1]);
            let char = element[2];
            if (usersPassword[index] != undefined) {
                let str1 = usersPassword.slice(0, index);
                let str2 = usersPassword.slice(index);
                usersPassword = str1 + char + str2;
                console.log(usersPassword);
            }
        }
        if (command == "Replace") {
            let charLetter = element[1];
            if (!usersPassword.includes(charLetter)) {
                continue;
            } else {
                let char = element[1].charCodeAt();
                let value = Number(element[2]);
                let sumChar = String.fromCharCode(char + value);
                usersPassword = usersPassword.split(charLetter).join(sumChar);
                console.log(usersPassword);
            }
        }
        if (command == "Validation") {
            let pattern1 = /^[A-Za-z0-9_]*$/g;
            let pattern2 = /[A-Z]+/g;
            let pattern3 = /[a-z]+/g;
            let pattern4 = /[0-9]+/g;
            if (usersPassword.length < 8) {
                console.log("Password must be at least 8 characters long!");
                continue;
            } else if (!pattern1.test(usersPassword)) {
                console.log("Password must consist only of letters, digits and _!");
                continue;
            } else if (!pattern2.test(usersPassword)) {
                console.log("Password must consist at least one uppercase letter!");
                continue;
            } else if (!pattern3.test(usersPassword)) {
                console.log("Password must consist at least one lowercase letter!");
            } else if (!pattern4.test(usersPassword)) {
                console.log("Password must consist at least one digit!");
            }
        }
    }
}
passwordValidator(['invalidpassword*',
    'Add 2 p',
    'Replace i -50',
    'Replace * 10',
    'Make Upper 2',
    'Validation',
    'Complete'])
console.log("...");
passwordValidator(['123456789',
    'Insert 3 R',
    'Replace 5 15',
    'Validation',
    'Make Lower 3',
    'Complete'])