59856
One year later , in 1880 , it was the fifth-largest city in the country after Plovdiv , Varna , Ruse and Shumen .
 Plovdiv, Varna, Ruse, Shumen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Plovdiv, Varna, Ruse, Shumen