diff --git a/a4/a4.c b/a4/a4.c
new file mode 100644
index 0000000..354499a
--- /dev/null
+++ b/a4/a4.c
@@ -0,0 +1 @@
+#include<stdio.h>
diff --git a/a4/a4.h b/a4/a4.h
new file mode 100644
index 0000000..dac4495
--- /dev/null
+++ b/a4/a4.h
@@ -0,0 +1,28 @@
+#ifndef A4_H
+#define A4_H
+
+#define SIZE 256
+
+typedef struct Tree {
+    char text[SIZE];
+    int isAnswer;
+    struct Tree *yes;
+    struct Tree *no;
+} Tree;
+
+// citanie stromu
+Tree* readTree();
+
+// kontrola prazdneho riadku
+int EmptyLine();
+
+// pocet listov
+int Leaves(Tree *node);
+
+// uvolnenie pamate
+void freeTree(Tree *node);
+
+// hra
+void start(Tree *node);
+
+#endif