query: SELECT DISTINCT ?entity ?entityLabel ?prop (strlen(?prop) as ?len) 
  WHERE
  {
      ?entity wdt:P1433 wd:Q665807 .  
      ?entity wdt:P31 wd:Q19389637 .  
      ?entity wdt:P1922 ?prop .
      SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en" }
  }