//@ts-check

/**
 * @param {string} str
 * @returns { Promise<string> }
 */
async function getline(str) {
    process.stdout.write(str)
    process.stdin.resume()
    process.stdin.setEncoding('utf8')
    let line = ""
    return new Promise((res, rej) => {
        process.stdin.on('data', function(chunk) {

            line += chunk
            if (chunk.toString('utf-8').endsWith('\n')) {
                process.stdin.pause()
                res(line.substring(0, line.length -1))
            }
        })
        process.stdin.on('error', function(err) {
            rej(err)
        })
    })
}

/**
 * @param { string } str
 * @returns
 */
function isAlpha(str){
    return /^[a-zA-Z]*$/.test(str)
}




module.exports = {
    isAlpha, getline

}