function passwordValidator(input) {
    let password = input.shift();
    for (let tokens of input) {
      tokens = tokens.split(" ");
      let currComm = tokens[0];
      if (currComm == "Make" && tokens[1] == "Upper") {
        let i = Number(tokens[2]);
        let copy = password.split("");
        if (i >= 0 && i < copy.length) {
          let letter = password.charAt(i).toUpperCase();
          password = password.replace(password.charAt(i), letter);
          console.log(password);
        }
      }
      if (currComm == "Make" && tokens[1] == "Lower") {
        let index = +tokens[2];
        let array = password.split("");
        if (index >= 0 && index < array.length) {
          let letter = password.charAt(index).toLowerCase();
          password = password.replace(password.charAt(index), letter);
          console.log(password);
        }
      }
      if (currComm == "Insert") {
        let index = Number(tokens[1]);
        let char = tokens[2];
        if (password[index] != undefined) {
          let part1 = password.slice(0, index);
          let part2 = password.slice(index);
          password = part1 + char + part2;
          console.log(password);
        }
      }
      if (currComm == "Replace") {
        let charLetter = tokens[1];
        if (!password.includes(charLetter)) {
          continue;
        } else {
          let char = Number(tokens[1].charCodeAt());
          let value = Number(tokens[2]);
          let sumChar = String.fromCharCode(char + value);
          password = password.split(charLetter).join(sumChar);
          console.log(password);
        }
      }
      if (currComm == "Validation") {
        let regexWhole = /^[A-Za-z0-9_]+$/g;
        let regexUpper = /[A-Z]+/g;
        let regexLower = /[a-z]+/g;
        let regexDigits = /[0-9]+/g;
        if (password.length < 8) {
          console.log("Password must be at least 8 characters long!");
        }
        if (!regexWhole.test(password)) {
          console.log("Password must consist only of letters, digits and _!");
        }
        if (!regexUpper.test(password)) {
          console.log("Password must consist at least one uppercase letter!");
        }
        if (!regexLower.test(password)) {
          console.log("Password must consist at least one lowercase letter!");
        }
        if (!regexDigits.test(password)) {
          console.log("Password must consist at least one digit!");
        }
      }
      if (currComm == "Complete") {
        break;
      }
    }
  }