function santaSecretHelper(data) {
    let key = data.shift();
    let decryptArr = [];
    let template = /@(?<name>[A-Za-z]+)[^@\-!:>]*!(?<behavior>[GN])!/;

    for (let i of data) {
        let strAfterDecrypt = '';

        if (i !== 'end') {

            for (let j of i) {
                let checkLetter = j.charCodeAt() - key;
                let decryptLetter = String.fromCharCode(checkLetter);
                strAfterDecrypt += decryptLetter;
            }
            decryptArr.push(strAfterDecrypt);

        } else {
            decryptArr.push(i);
        }
    }

    let printArr = [];

    for (let element of decryptArr) {
        if (element === 'end') break;

        let info = element.match(template);

        if (info === null) break;

        let name = info.groups.name;
        let behavior = info.groups.behavior;

        if (behavior === 'G') {
            printArr.push(name);
        }
    }

    console.log(printArr.join('\n'));
}