BEGIN{y=1900;while(y++<2100){ly=y;by="";while(ly){if(ly%2==0){by="0"by;}else{by="1"by;}ly=int(ly/2);}rby="";for(i=length(by);i>0;i--){rby=rby substr(by,i,1)};if(rby==by){print y}}}