diff --git a/cv7/program.c b/cv7/program.c
index 3e21483..64fed30 100644
--- a/cv7/program.c
+++ b/cv7/program.c
@@ -10,7 +10,7 @@ struct tree {
     struct tree* right;
 };
 
-struct tree* read_tree(int counter){  
+struct tree* read_tree(int* counter){  
     char buffer[SIZE];  
     memset(buffer, 0, SIZE);  
     char* r = fgets(buffer, SIZE, stdin);  
@@ -23,7 +23,7 @@ struct tree* read_tree(int counter){
     strcpy(tree->value,r);
     assert(tree->value); 
     if (buffer[0] == '*') {
-        counter++;
+        (*counter)++;
         return tree;
     }
     tree->left = read_tree(counter);
@@ -51,6 +51,7 @@ void print_tree(struct tree* tree,int offset){
         exit(0);
     }
     char r = getchar();
+    getchar();
     if (r == 'a') {
         print_tree(tree->left, offset + 3);
     } else if (r == 'n') {