diff --git a/POJ/3617.cpp b/POJ/3617.cpp
new file mode 100644
index 0000000..4339240
--- /dev/null
+++ b/POJ/3617.cpp
@@ -0,0 +1,150 @@
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <vector>
+using namespace std;
+
+vector<char> S;
+
+bool operator < (vector<char>& a,vector<char>& b)
+{
+    int maxsize=a.size()>b.size()?a.size():b.size();
+    for(int i=0;i<maxsize;i++)
+    {
+        if(a.at(i)>b.at(i))
+        {
+            return false;
+        }
+        else if(a.at(i)<b.at(i))
+        {
+            return true;
+        }
+    }
+    return a.size()<b.size();
+}
+
+bool operator > (vector<char>& a,vector<char>& b)
+{
+    int maxsize=a.size()>b.size()?a.size():b.size();
+    for(int i=0;i<maxsize;i++)
+    {
+        if(a.at(i)>b.at(i))
+        {
+            return true;
+        }
+        else if(a.at(i)<b.at(i))
+        {
+            return false;
+        }
+    }
+    return a.size()>b.size();
+}
+
+bool operator == (vector<char>& a,vector<char>& b)
+{
+    if(a.size()!=b.size())
+    {
+        return false;
+    }
+    int maxsize=a.size();
+    for(int i=0;i<maxsize;i++)
+    {
+        if(a.at(i)!=b.at(i))
+        {
+            return false;
+        }
+    }
+    return true;
+}
+
+/*
+int main()
+{
+    int n;
+    scanf("%d%*c",&n);
+    for(int i=0;i<n;i++)
+    {
+        char c;
+        scanf("%c%*c",&c);
+        S.push_back(c);
+    }
+    for(int i=0;i<n;i++)
+    {
+        if(S.at(0)<S.at(S.size()-1))
+        {
+            printf("%c",S.at(0));
+            S.erase(S.begin());
+        }
+        else
+        {
+            printf("%c",S.at(S.size()-1));
+            S.erase(S.end()-1);
+        }
+    }
+    return 0;
+}
+*/
+
+char XS[2048];
+int L,R;
+
+int main()
+{
+    int n;
+    scanf("%d%*c",&n);
+    L=0;
+    R=n-1;
+    for(int i=0;i<n;i++)
+    {
+        scanf("%c%*c",&XS[i]);
+    }
+    int cnt=0;
+    for(int i=0;i<n;i++)
+    {
+        if(XS[L]<XS[R])
+        {
+            printf("%c",XS[L]);
+            L++;
+        }
+        else if(XS[L]>XS[R])
+        {
+            printf("%c",XS[R]);
+            R--;
+        }
+        else
+        {
+            /// XS[L] == XS[R]
+            bool check=false;
+            for(int i=1;i<R-L;i++)
+            {
+                if(XS[L+i]<XS[R-i])
+                {
+                    check=true;
+                    printf("%c",XS[L]);
+                    L++;
+                    break;
+                }
+                else if(XS[L+i]>XS[R-i])
+                {
+                    check=true;
+                    printf("%c",XS[R]);
+                    R--;
+                    break;
+                }
+            }
+            if(!check)
+            {
+                printf("%c",XS[L]);
+                L++;
+            }
+        }
+        cnt++;
+        if(cnt==80)
+        {
+            printf("\n");
+            cnt=0;
+        }
+    }
+    printf("\n");
+    return 0;
+}