You can (ab)use the magical increment properties of ++:
my $c='aff001';
print $c++, "\n" for 0..5;
__END__
aff001
aff002
aff003
aff004
aff005
aff006
You should be careful with overflows, though:
my $c='aff998';
print $c++, "\n" for 0..5;
__END__
aff998
aff999
afg000
afg001
afg002
afg003
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