@InvocableMethod(Label ='Do Callout' description='does a callout')
public static List<String> DoCallout(List<String> input){
    String city = input.get(0);
    Http http = new Http();
    HttpRequest request = new HttpRequest();
    request.setEndpoint('https://api.openweathermap.org/data/2.5/weather?q='+city+'&APPID=67fc7cb50b5b109eb50966923d8e4fcc');
    request.setMethod('GET');
    HttpResponse response = http.send(request);
    if (response.getStatusCode() == 200) {
       Map<String, Object> results = (Map<String, Object>)
       JSON.deserializeUntyped(response.getBody());

       List<Object> animals = (List<Object>) results.get();
       return animals;
    }
    return new List<String> {'Test'};
}