$s=99;$c='abcdef';for(<>){chomp;$w=$_;$l=y///c;@m=grep{1+index$w,$_}split//,$c;@m>5&&$s>$l||next;$s=$l;$n=$w}print$n

##</code><code>##

$s=9;$c='abcdef';for(<>){chop;$w=$_;$l=y///c;(5<grep{1+index$w,$_}split//,$c)&&$s>$l||next;$s=$l;$n=$w}print$n

##</code><code>##

$s=9;for(<>){chop;$w=$_;$l=y///c;(5<grep{1+index$w,$_}split//,'abcdef')&&$s>$l||next;$s=$l;$n=$w}print$n

##</code><code>##

$s=9;for(<>){chop;$w=$_;$l=y///c;(5<grep{1+index$w,$_}split//,'abcdef')&&$s>$l&&do{$s=$l;$n=$w}}print$n

##</code><code>##

$s=9;for(<>){$w=$_;$l=y///c;(6<grep{1+index$w,$_}split//,"abcdef\n")&&$s>=$l&&do{$s=$l;$n=$w}}print$n