Q: Given the following Catalan sentence, indicate the name entities (i.e., the real-world objects such as a person, location, organization, etc. that can be denoted with a proper name) such as 'New York Times'.  For each words of a named-entity, indicate their type 'LOC' or 'ORG' or 'PER', where 'LOC' indicates a location entity (such as 'New York City', 'ORG' indicates the token of an organization (such as 'Amazon'), 'PER' indicates the tokens of a person entity (such as 'Jeff Bezos'). Named entities with other types should be indicated with 'MISC'. To indicate boundaries of an entity, use IOB (Inside-Output-Begin) prefixes. The B- prefix before a tag indicates that the word is the beginning of a named entity. The I- prefix indicates that the word is inside a bigger chunk. For example, you can break 'New York' to 'New' and 'York.' and tag them as 'B-LOC' and 'I-LOC'. Any token that doesn't belong to a named entity must be tagged with 'O'. 
Davant d' aquesta situació ' insostenible ' , ERC proposa el concert econòmic , un sistema ' legal ' , que és vigent a dues comunitats autònomes .
A:
Davant (O) d' (O) aquesta (O) situació (O) ' (O) insostenible (O) ' (O) , (O) ERC (B-ORG) proposa (O) el (O) concert (O) econòmic (O) , (O) un (O) sistema (O) ' (O) legal (O) ' (O) , (O) que (O) és (O) vigent (O) a (O) dues (O) comunitats (O) autònomes (O) . (O)