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+ is HQ9+ with two differences: there are no "H", "Q", or "9" instructions, and all characters that are not + are explicitly ignored.

There is an interpreter written for + in perl in 60 bytes:

my$r=$ARGV[0];open my$z,'<',$r or die$!;my$c=()=<$z>=~/\+/g;

There is another interpreter written for + in Lua, Hosted here