diff --git a/BestCoder/AStar-PRE/1002.cpp b/BestCoder/AStar-PRE/1002.cpp
new file mode 100644
index 0000000..0d8a61f
--- /dev/null
+++ b/BestCoder/AStar-PRE/1002.cpp
@@ -0,0 +1,55 @@
+#include <cstdio>
+#include <cstring>
+#include <cstdlib>
+using namespace std;
+inline void bzero(void* ptr,size_t size)
+{
+    memset(ptr,0,size);
+}
+char msg[102400];
+char ans[102400];
+int cnt=0;
+
+int main()
+{
+    int key;
+    int turn;
+    scanf("%d%*c",&turn);
+    for(int tt=0;tt<turn;tt++)
+    {
+        bzero(msg,102400);
+        bzero(ans,102400);
+        cnt=0;
+        gets(msg);
+        scanf("%d%*c",&key);
+        int len=strlen(msg);
+        int LL=len%key;
+        int L=len/key;
+        for(int i=0;i<L;i++)
+        {
+            for(int j=0;j<key;j++)
+            {
+                int v;
+                if(j<LL)
+                {
+                    v=j*(L+1)+i;
+                }
+                else
+                {
+                    v=(L+1)*LL+(j-LL)*L+i;
+                }
+                ans[cnt]=msg[v];
+                cnt++;
+            }
+        }
+        /// "L" th Line. (i==L)
+        for(int j=0;j<LL;j++)
+        {
+            int v=(j+1)*(L+1)-1;
+            ans[cnt]=msg[v];
+            cnt++;
+        }
+        printf("Case #%d:\n%s\n",tt+1,ans);
+    }
+    return 0;
+}