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#!/usr/bin/gawk -f
BEGIN {
RS = "[a-z]"
# START PART 1
COUNT = 4
# END PART 1 START PART 2
COUNT = 14
# END PART 2
}
NR > COUNT {
for (i = 2; i <= length(a); i++)
a[i - 1] = a[i]
delete a[length(a)]
}
{ a[(NR == 1 ? 0 : length(a)) + 1] = RT }
NR > COUNT {
for (i in a) {
if (_a[a[i]]++ == 1) {
delete _a
next
}
}
print NR
exit
}
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