diff --git a/TravelCostCalculator.java b/TravelCostCalculator.java
index 6f89acb..194036b 100644
--- a/TravelCostCalculator.java
+++ b/TravelCostCalculator.java
@@ -6,68 +6,68 @@
 import java.util.Map;
 
 public class TravelCostCalculator {
-    static Map<String, Double> a = new HashMap<>();
-    static Map<String, Double> b = new HashMap<>();
-    static Map<String, Double> c = new HashMap<>();
+    static Map<String, Double> hotel = new HashMap<>();
+    static Map<String, Double> currencyExchange = new HashMap<>();
+    static Map<String, Double> flight = new HashMap<>();
 
-    static void l1(String file) throws IOException {
+    static void list1(String file) throws IOException {
         BufferedReader reader = new BufferedReader(new FileReader(file));
-        String i; 
-        while ((i = reader.readLine()) != null) {
-            String[] p = i.split(",");
-            a.put(p[0].toUpperCase(), Double.parseDouble(p[1]));
+        String hotelList; 
+        while ((hotelList = reader.readLine()) != null) {
+            String[] hotelData = hotelList.split(",");
+            flight.put(hotelData[0].toUpperCase(), Double.parseDouble(hotelData[1]));
         }
     }
 
-    static void l2(String file) throws IOException {
+    static void list2(String file) throws IOException {
         BufferedReader reader = new BufferedReader(new FileReader(file));
-        String i;
-        while ((i = reader.readLine()) != null) {
-            String[] p = i.split(",");
-            b.put(p[0].toUpperCase(), Double.parseDouble(p[1]));
+        String currencyExchangeList;
+        while ((currencyExchangeList = reader.readLine()) != null) {
+            String[] currencyExchangeData = currencyExchangeList.split(",");
+            currencyExchange.put(currencyExchangeData[0].toUpperCase(), Double.parseDouble(currencyExchangeData[1]));
         }
     }
 
-    static void l3(String file) throws IOException {
+    static void list3(String file) throws IOException {
         BufferedReader reader = new BufferedReader(new FileReader(file));
-        String i;
-        while ((i = reader.readLine()) != null) {
-            String[] p = i.split(",");
-            c.put(p[0].toUpperCase(), Double.parseDouble(p[1]));
+        String flightList;
+        while ((flightList = reader.readLine()) != null) {
+            String[] flightData = flightList.split(",");
+            flight.put(flightData[0].toUpperCase(), Double.parseDouble(flightData[1]));
         }
     }
 
     public static void main(String[] args) {
         try {
-            l1("data/hotel_rates.csv");
-            l2("data/exchange_rates.csv");
-            l3("data/flight_costs.csv");
+            list1("data/hotel_rates.csv");
+            list2("data/exchange_rates.csv");
+            list3("data/flight_costs.csv");
 
             BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
 
             System.out.print("Enter your destination: ");
             String destination = reader.readLine().toUpperCase();
 
-            double flight_cost = c.getOrDefault(destination, 0.0);
-            double hotel_cost = a.getOrDefault(destination, 0.0);
+            double flightCost = flight.getOrDefault(destination, 0.0);
+            double hotelCost = hotel.getOrDefault(destination, 0.0);
 
             System.out.print("Enter your stay duration in days: ");
-            int stay_duration = Integer.parseInt(reader.readLine());
-            hotel_cost *= stay_duration;
+            int stayDuration = Integer.parseInt(reader.readLine());
+            hotelCost *= stayDuration;
 
-            double total_cost_usd = flight_cost + hotel_cost;
+            double totalCostUSD = flightCost + hotelCost;
 
-            System.out.printf("Flight cost: USD %.2f\n", flight_cost);
-            System.out.printf("Hotel cost (%d days): USD %.2f\n", stay_duration, hotel_cost);
-            System.out.printf("Total: USD %.2f\n", total_cost_usd);
+            System.out.printf("Flight cost: USD %.2f\n", flightCost);
+            System.out.printf("Hotel cost (%d days): USD %.2f\n", stayDuration, hotelCost);
+            System.out.printf("Total: USD %.2f\n", totalCostUSD);
 
-            String[] available_currencies = b.keySet().toArray(new String[0]);
-            System.out.print("Select your currency for final price estimation(" + String.join(", ", available_currencies) + "): ");
-            String selected_currency = reader.readLine();
+            String[] availableCurrencies = currencyExchange.keySet().toArray(new String[0]);
+            System.out.print("Select your currency for final price estimation(" + String.join(", ", availableCurrencies) + "): ");
+            String selectedCurrency = reader.readLine();
 
-            double final_price_local_currency = total_cost_usd * b.get(selected_currency);
+            double final_price_local_currency = totalCostUSD * currencyExchange.get(selectedCurrency);
 
-            System.out.printf("Total in %s: %.2f\n", selected_currency, final_price_local_currency);
+            System.out.printf("Total in %s: %.2f\n", selectedCurrency, final_price_local_currency);
         } catch (IOException e) {
             e.printStackTrace();
         }