import java.util.*;
public class Main {
    public static void main(String[] args) {
        Map<String, String[]> map = Map.of("mic.ad", new String[]{"Ayutthaya4", "Brazil", "Changi", "Dresden", "Guangzhou"}, "nedcard.nl", new String[]{"Wijchen account"});
        System.out.println(Arrays.toString(search(map, "Brazil")));
    }
    public static String[] search(Map<String, String[]> map, String value){
        return map.entrySet().stream().filter(e -> Arrays.stream(e.getValue()).anyMatch(value::equals)).findAny().map(e -> new String[]{e.getKey(), value}).orElse(null);
    }
}

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