#/*X
                      d='XXXXXXX*/include<png.h>
               /*XXXXXXXXXXXXXXXXX*/#include<math.h>
            /*XXXXXXXXXXXXXXXXXXXXXX*/#include<stdio.h>
          /*XXXXXXXXXXXXXXXXXXXXXXXXX*/#include<stdlib.h>
        /*XX'.gsub(/\*[^*]*[*]/,'');i='*/#include<string.h>
      /*XXX';x||=[];x+=  [d];s=x.size;i=%!X*/#include<time.h>
     typedef int/**/_;    _ D,o,R,O,T,H,Y[2][2],x,y,w,h[2][2];
    typedef/*X*/double      f;png_image/*XXXXXXXXX*/I;png_bytep
   z[2];_/*XXXXXX*/L(         ){return(png_image_finish_read(&I,
  NULL,*z,0,NULL));}f           p,q,P,Q,a,b,c,d,i,j,k,m,n,e,E;_/*
  X*/M(char*v){return             png_image_begin_read_from_file(&
 I,v);}void l(char*v                ){if(M(v)){H=I.height;for(w=I.
 width;o<2;){z[o++]=                   (png_bytep)malloc(D=w*H*4);}
T=*z&&z[1];I.format      =/*              */PNG_FORMAT_RGBA;T=T&&L(
)?-1:1;}}_/**/g(_(      u),                 char*v){return(printf(u
?u-1?"Error wri"/*      X              X*/  "ting\x20%s\n":"Error "
"reading\x20%s\n"                  :"%s  "   "<input.pn" "g>\40<ou"
"tput1.png>"/*XX            X   */"\40"      "<output2.p" "ng>\n",v
));}void/**/t(f               (u),f(v))      {m=a*u-b*v+   c;n=b*u+
a*v+d;}_/**/s(f              u,    f         (v),f(U),f(   V)){u-=U
;v-=V;p=i*U+j*                                V+k;return( u*u+v*v)<
p*p;}f/**/r(f                                 v){return( (f)rand()/
RAND_MAX)*v*                                  22/7;}_/**/main(_(u),
char**v){I.  version                          =PNG_IMAGE_VERSION/*
*/;if(u==4){l  (v[T                            =1]);if(T<0){memcpy
 (z[1],*z,D)                                   ;srand(time(NULL));
 p=r(29)+20           ;                        p/=w>H?w:H;a=cos(q=
 r(1))*p;b=p                                   *sin(q);c=r(1);d=r(
  1);i=cos(q                                   =r(2));j=sin(q);for
  (k=0;O<4;++                                  O){t(O%2*w,(O&2)/2*
   H);p=i*m+j*                  n             +k;e=O<1||e>p?p:e;E=
   O<1||E<p?p:E            ;}i*=            p=  0.5*sqrt(2)/(E-e);
   j*=p;for(k=-e*                          p    ;x<2;x++){for(y=0;y
    <2;h[x][y++]=r(                     2)      +2 )Y[x][y]=r(3);}y=
    o=0;for(;y<H;y++)                {x=         0  ;for(;x<w;x++,++
     o){t(x, y);D=sizeof          ('\1'          )  >1;if(D){e=ceil(m)
     ;E=ceil (n);D=s(m,n,floor(m),E)||s          (m ,n,e,floor(n))||s(m
     ,n,e,E)  ||s(m,n,floor(m),floor(n)          ); }else{p=floor(m);P=m-
      p;Q=n-  (q=floor(n));if(P+Q<0.25           || P+Q>1.75||Q-P>.75||P-Q>
      .75){P   =round(m);Q=round(n);T             = (_) (P  +Q)&1;e=fabs(n-Q);
      D=m-P>    e||m-P<-e;for(O= 0;O              <2;D^=R>   h[O++][T]/2){R=fmod(Y
       [O][      T]+P  -O*Q,h[O ][T               ]);R +=     R<+0?h[O][T]:0;}}else{D=
       (_)(        p+q   )&1;} }*                  (_  *       )(z[D]+o*4)=0;}}T=-1;for(o=0
       ;T<0          &&                            o<          02;  ++o)T=png_image_write_to_file
       (&I,                                        v[o         +2]     ,0,z[o],0,  NULL)?T:o+2;}}/*XXX
       XXX                                          XX         X!;        puts(s!=1?           "":x.sort*
       "")                                           ;i       ='X             '+%{XXX*/               return
       /*                                             XX     X*/                   T<0?0:g                 (T>
       2?                                              2:T,v[                                                 T]
       )                                                 ;}