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Ruby, 46 bytes

->{eval [n=gets.chop,n.size,*n.chars].join ?+} 

Edit: If not using lambda, 42 bytes

eval [n=gets.chop,n.size,*n.chars].join ?+ 

Ruby, 46 bytes

->{eval [n=gets.chop,n.size,*n.chars].join ?+} 

Edit: If not using lambda, 42 bytes

eval [n=gets.chop,n.size,*n.chars].join ?+ 

Edit2: Here's the tio for the case -123

Ruby, 46 bytes

->{eval [n=gets.chop,n.size,*n.chars].join ?+} 

Ruby, 46 bytes

->{eval [n=gets.chop,n.size,*n.chars].join ?+} 

Edit: If not using lambda, 42 bytes

eval [n=gets.chop,n.size,*n.chars].join ?+ 

Ruby, 46 bytes

->{eval [n=gets.chop,n.size,*n.chars].join ?+} 

Ruby, 46 bytes

->{eval [n=gets.chop,n.size,*n.chars].join ?+}