Concatenate Lookup Fields

Concatenate Lookup Fields

Hi,

I have a form w/ the fields(type) - Year(single line), Make(lookup), Model(single line), Color (lookup)

A Formula Field NameLong with the formula

input.Year + input.Make + input.Model + input.Color 

Result should be 1995 Ford Mustang Blue

Instead the lookup field data is being replaced with long numbers such as

1995 3877384000000039079 Mustang 3877384000000039015

Can anyone help please.

Thank you