class Raindrops {

    private def primeSounds = [ 3:'Pling', 5:'Plang', 7:'Plong']

    def convert(num) {
        def result = new String()
        primeSounds.each({ k, v ->
            if ((num % k).equals(0)) { result += v }
        })
        result.isEmpty() ? num.toString() : result
    }

}