function fancy(input = []) {
    let num = Number(input.shift());
    let pattern = /^@#+(?=[A-Z])([A-Za-z0-9]{6,})(?<=[A-Z])@#+$/m;

    for (let i = 1; i <= num; i++) {
        let data = input.shift();
        let match = pattern.exec(data);

        if (match !== null) {
            let matches = match[1];
            let digits = matches.match(/\d+/g);
            if (digits !== null) {
                console.log(`Product group: ${digits.join('')}`);
                continue;
            }
            console.log(`Product group: 00`);
            continue;
        }
         console.log(`Invalid barcode`);
    }
}