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#!/usr/bin/perl

$i = "1101010001";

$i =~ s/[^0]//g; <--0 ÀÌ¿Ü¿¡´Â ÀüºÎ ¾ø¾Ö ¹ö¸°´Ù.

$len = length($i);

print $len;

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