diff --git a/conditions.py b/conditions.py
new file mode 100644
index 0000000..e69de29
diff --git a/javakata.java b/javakata.java
new file mode 100644
index 0000000..ee2af5a
--- /dev/null
+++ b/javakata.java
@@ -0,0 +1,12 @@
+public class SquareDigit {
+
+  public int squareDigits(int n) {
+    // separar cada dígito de n
+    List<Integer> listn = new List<Integer>();
+    for (x = 0; x < n.length; x++){
+      listn.add(x);
+    }
+    // recorrer listn para comprobar cuantos dígitos tiene
+  }
+
+}
\ No newline at end of file
diff --git a/lists.py b/lists.py
index 563084b..aa03a40 100644
--- a/lists.py
+++ b/lists.py
@@ -1,18 +1,18 @@
-# x = object()
-# y = object()
+x = object()
+y = object()
 
-# x_list = [x] * 10
-# y_list = [y] * 10
-# big_list = []
+x_list = [x] * 10
+y_list = [y] * 10
+big_list = []
 
-# big_list = x_list + y_list
+big_list = x_list + y_list
 
-# print("x_list contains %d objects" % len(x_list))
-# print("y_list contains %d objects" % len(y_list))
-# print("big_list contains %d objects" % len(big_list))
+print("x_list contains %d objects" % len(x_list))
+print("y_list contains %d objects" % len(y_list))
+print("big_list contains %d objects" % len(big_list))
 
-# # List().count(x) cuenta el número de items que hay con el valor x en la lista
-# if x_list.count(x) == 10 and y_list.count(y) == 10:
-#     print("Almost there...")
-# if big_list.count(x) == 10 and big_list.count(y) == 10:
-#     print("Great!")
\ No newline at end of file
+# List().count(x) cuenta el número de items que hay con el valor x en la lista
+if x_list.count(x) == 10 and y_list.count(y) == 10:
+    print("Almost there...")
+if big_list.count(x) == 10 and big_list.count(y) == 10:
+    print("Great!")
\ No newline at end of file
diff --git a/string_operators.py b/string_operators.py
index b11ff5a..4925527 100644
--- a/string_operators.py
+++ b/string_operators.py
@@ -1,11 +1,11 @@
-# nombre = 'Jaume'
-# altura = 1.73
-# print('Nombre: %s, altura: %.2f' % (nombre, altura))
-
-# data = ('Jaume', 'Ordinas', 100.77)
-# format_string = 'Hello %s %s. Your current balance is $%s.' 
-# print(format_string % data)
-# ## print(format_string, data[0], data[1] + '. Your current height is %.2fm' % data[2])
+nombre = 'Jaume'
+altura = 1.73
+print('Nombre: %s, altura: %.2f' % (nombre, altura))
+
+data = ('Jaume', 'Ordinas', 100.77)
+format_string = 'Hello %s %s. Your current balance is $%s.' 
+print(format_string % data)
+## print(format_string, data[0], data[1] + '. Your current height is %.2fm' % data[2])
 
 text = "abcdefghi"
 # text[start:stop:step]