#include <stdio.h>
#define N 100000
int partition(int *A,int p,int r){
    int x,i,j,t;
    x = A[r];
    i = p-1;
    for(j = p;j < r; j++){
        if(A[j] <= x){
            i++;
            t = A[i];
            A[i] = A[j];
            A[j] = t;
        }
    }
    t = A[i + 1];
    A[i + 1] = A[r];
    A[r] = t;
    return i + 1;
}

int main(){
    int i,q;
    int A[N],n;
    scanf("%d",&n);
    for(i=0;i<n;i++) scanf("%d",&A[i]);
    
    q = partition(A,0,n - 1);
    
    for(i=0;i<n;i++){
      if(i > 0) printf(" ");
      if(i == q) printf("[");
      printf("%d",A[i]);
      if(i == q) printf("]");
    }
    printf("\n");
  
  return 0;
}

