#include <time.h>
#include <stdio.h>
#include <stdlib.h>

#ifndef IDX
#define IDX 1
#endif
#if IDX==1 // square

  int main(){;unsigned
  a,i=1,j=0,t[256];for
  (srand(time(0));i;)j
  ?(--i||~a>>8?putchar
  (i?t[j]:a),i++:0)?t[
  j]=t[--i],j=i>2?rand
  ()%(i-2)+2:1,1:j--:(
  a=getchar(),(1==a>>7
  ||26>(a|32)-97)&&256
  >i?t[i++]=a,0:j++);}

#elif IDX==2

  int main(){;unsigned
  a=0,i,j,t[256];srand
  (time(0));for(;256>a
  ;){for(i=j=0;(26>((a
  =getchar())|32)-97||
  1==a>>7)&&i<256;)t[i
  ++]=a;;for(;i||~a>>8
  ?putchar(i?t[j]:a),i
  --:0;j=i>1?rand()%(i
  -1)+1:0)t[j]=t[i];}}

#elif IDX==3 // round

       int main()
    {unsigned a,i=1,
  j=0,t[64];for(srand(
  time(0));i;)j?(--i||
 ~a>>8?putchar(i?t[j]:a
 ),i++:0)?t[j]=t[--i],j
 =i>2?rand()%(i-2)+2:1,
  1:j--:(a=getchar(),(
  26>(a|32)-97||1==a>>
    7)&&i<64?t[i++]=
       a,0:j++);}

#elif IDX==4

       int main()
    {unsigned a,i,j=
  a=0,t[64];for(srand(
  time(0)),i=0;~a>>8;)
 {for(;a=getchar(),(26>
 (a|32)-97||1==a>>7)&&i
 <64;)t[i++]=a;;for(;!i
  &&a>>8?0:putchar(i?t
  [j]:a),i;j=i>1?rand(
    )%(i-1)+1:0)t[j]
       =t[--i];}}

#elif IDX==5 // profile

          int main
        (){;unsigned
       a=0,i,j,t[64];
       srand(time(0))
       ;for(;a<256;~a
       >>8?putchar(a)
       :0){for(i=j=0;
        a=getchar(),
         ((a|32)-97
          <26||a>>
          7==1)&&i
       <64;)t[i++]=a;
 for(i-=1;i+1;putchar(t[j])
  ,t[j]=t[i--],j=i?rand()%
     i+1:0);}return!a;}

#endif