#include 
  
   
#include 
   
     #include 
    
      using namespace std; int n,m; char S[2100],P[2100]; int main() { #ifdef xxz freopen("in.txt","r",stdin); #endif // xxz ios::sync_with_stdio(false); cin.tie(0); int sum = 0; while(cin>>n) { for(int i = 0; i < n; i++) cin>>S[i]; int a = 0, b = n-1,cent = 0; while(a <= b) { bool left = false;//将从左起和由起的字符串比较 for(int i = 0; a + i <= b; i++) { if(S[a+i] < S[b-i]) { left = true; break; } else if(S[a+i] > S[b-i]) { left = false; break; } } if(left) P[cent++] = S[a++]; else P[cent++] = S[b--]; } for(int i = 0; i < n; i++) { sum += 1; cout<