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#23456789_123456789_123456789_123456789_123456789_123456789_123456789_
$_=<DATA>;push@_,@+while/_/g;{for$a(0..$#_){substr($_,$_[$a]-1,1
...
__DATA__
The number of 0s in this sentence is _, of 1s is _, of 2s is _, of 3s 
+is _, of 4
s is _, of 5s is _, of 6s is _, of 7s is _, of 8s is _, and of 9s is _
+.

sub{$a=<DATA>;$a=~s,($_.*?)_,$1.pop,efor-1..9;print$a}->(1,1,2,1,1,1,2
+,3,7,1)