function activationKeysProgram(params) {
    let workStr = params.shift();
    let command = params.shift();
    let flag = true;

    while (command !== 'Generate') {
        command = command.split('>>>');


        if (command[0] == 'Contains') {
            if (workStr.includes(command[1])) {
                console.log(`${workStr} contains ${command[1]}`);

            } else {
                console.log(`Substring not found!`)
                flag=false
            }
        }
        else if (command[0] == 'Flip') {
            if (command[1] === 'Upper') {
                command[2]=Number(command[2]);
                command[3]=Number(command[3]);
                let str = workStr.substring(command[2], command[3]);

                let upper = str.toUpperCase();
                workStr = workStr.replace(str, upper);
            }
            else if (command[1] === 'Lower') {
                command[2]=Number(command[2]);
                command[3]=Number(command[3]);
                let str = workStr.substring(command[2], command[3]);
                let lower = str.toLowerCase();
                workStr = workStr.replace(str, lower);
            }
        }
        else if (command[0] == 'Slice') {
            command[1]=Number(command[1]);
            command[2]=Number(command[2]);
            let slice = workStr.substring(command[1], command[2]);
            workStr = workStr.replace(slice, '');
        }


        if(flag == true){
            console.log(workStr);
        }
        flag=true;
        command = params.shift();
    }
    console.log(`Your activation key is: ${workStr}`);
}
activationKeysProgram([
    'abcdefghijklmnopqrstuvwxyzdef',
    'Slice>>>2>>>6',
    'Flip>>>Upper>>>3>>>14',
    'Flip>>>Lower>>>5>>>7',
    'Contains>>>def',
    'Contains>>>deF',
    'Generate'])