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

$s=9;$c='abcdef';for(<>){chop;$w=$_;$l=y///c;(5<grep{1+index$w,$_}spli
+t//,$c)&&$s>$l||next;$s=$l;$n=$w}print$n

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

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

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