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import java.util.Map;
import java.util.HashMap;

public class Main {
    private Map<String, String> map;

    public Main() {
        Map<String, String> map = new HashMap<String, String>();
        map.put("a", "123");
        map.put("b", "d");
        map.put("c", "456");

        System.out.println(getValueAsInt("a"));
        System.out.println(getValueAsInt("b"));
        System.out.println(getValueAsInt("c"));
    }

    public int getValueAsInt(String key) {
        if(map.get(key) == null){
            return -1;
        } else {
            int res;
            try{
                res = Integer.parseInt(map.get(key));
            } catch(NumberFormatException e) {
                e.printStackTrace();
                res = -1;
            }
            return res;
        }
    }

    public static void main(String args[]){
        new Main();
    }
}