function solve(input){
    input.shift();
    let pattern = /(@#{1,})([A-Z][A-Za-z0-9]{4,}[A-Z])\1/gm;

    input.forEach(element => {
        let containsValidBarcode = pattern.test(element);
        if(containsValidBarcode){
            element = element.split('');
            let outputDigits = [];
            element.forEach(digit => {
                let patternDigit = /\d/g
                let match = patternDigit.exec(digit);
                if (match) {
                    outputDigits.push(match);
                }
            })

           if(outputDigits.length > 0 ) {
                console.log(`Product group: ${outputDigits.join('')}`)
           }
           else{
            console.log(`Product group: 00`)
           }
        }
        else{
            console.log('Invalid barcode')
        }
    })
}