function randomString(n) {
	let str = 'abcdefghijklmnopqrstuvwxyz9876543210'
	let tmp = '',
	i = 0,
	l = str.length;
	for(i = 0; i < n; i ++) {
		tmp += str.charAt(Math.floor(Math.random()* l));
	}
	return tmp;
}

module.exports = randomString;