diff --git a/14/14-1.c b/14/14-1.c
new file mode 100644
index 0000000..690bcf6
--- /dev/null
+++ b/14/14-1.c
@@ -0,0 +1,58 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "../check_alloc.h"
+
+// LIST(string) DATASTRUCTURE
+
+#define INITIAL_SIZE BUFSIZ
+typedef char LIST_TYPE;
+
+typedef struct
+{
+    LIST_TYPE *list;
+    size_t size;
+    size_t capacity;
+} LIST;
+
+LIST *new_list(void)
+{
+    LIST *p_list = calloc(1, sizeof(LIST));
+    CHECK_ALLOC(p_list);
+    p_list->capacity = INITIAL_SIZE;
+    p_list->list = calloc(p_list->capacity, sizeof(LIST_TYPE));
+    CHECK_ALLOC(p_list->list);
+    p_list->size = 0;
+    return p_list;
+}
+
+void add_list(LIST *list, LIST_TYPE elem)
+{
+    if (list->size >= list->capacity)
+    {
+        list->capacity *= 2;
+        list->list = realloc(list->list, list->capacity * sizeof(LIST_TYPE));
+        CHECK_ALLOC(list->list);
+    }
+    list->list[list->size] = elem;
+    list->size++;
+}
+
+//
+
+LIST *read_template(FILE *p_file)
+{
+    LIST *p_string = new_list();
+    char buf[BUFSIZ];
+    fscanf(p_file, "%[^\n]\n\n", buf);
+    strcpy(p_string->list, buf);
+    return p_string;
+}
+
+int main(int argc, char const *argv[])
+{
+    FILE *p_file = fopen("input", "r");
+    LIST *p_string = read_template(p_file);
+    printf("%s\n", p_string->list);
+    return 0;
+}
diff --git a/15/15-1.c b/15/15-1and2.c
similarity index 100%
rename from 15/15-1.c
rename to 15/15-1and2.c
diff --git a/17/17-1.c b/17/17-1and2.c
similarity index 100%
rename from 17/17-1.c
rename to 17/17-1and2.c
diff --git a/18/18-1.c b/18/18-1.c
new file mode 100644
index 0000000..5352a6f
--- /dev/null
+++ b/18/18-1.c
@@ -0,0 +1,50 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+#include "../check_alloc.h"
+
+typedef union
+{
+    struct _FISH_NUMBER *pair;
+    int integer;
+} ANY_NUMBER;
+
+typedef struct _FISH_NUMBER
+{
+    ANY_NUMBER left;
+    bool left_integer;
+    ANY_NUMBER right;
+    bool right_integer;
+} FISH_NUMBER;
+
+FISH_NUMBER *new_number()
+{
+    FISH_NUMBER *p_number = calloc(1, sizeof(FISH_NUMBER));
+    CHECK_ALLOC(p_number);
+    return p_number;
+}
+
+typedef enum
+{
+    FIRST,
+    SECOND
+} STATE;
+
+FISH_NUMBER *str_2_number(char *number)
+{
+    FISH_NUMBER *p_number = new_number();
+    number = strchr(number, '[');
+    if ('[' == *(number + 1))
+    {
+        str_2_number(number + 1);
+    }
+}
+
+int main(int argc, char const *argv[])
+{
+    char number[] = "[[1,2],3]";
+    int a, b;
+    printf("%d\n", sscanf(number, "%d", &a, &b));
+    return 0;
+}