This is the 16420th most frequent Polish word.
wchodzących
"Entering" or "emerging."
In this sentence, 'wchodzących' is a participle describing students who are in the process of entering the classroom.
Uczniowie wchodzących do klasy byli uśmiechnięci.
The students entering the classroom were smiling.
Here, 'wchodzących' modifies an implied subject referring to people entering the mysterious castle.
W książce opisano historie wchodzących do tajemniczego zamku.
The book described the stories of those entering the mysterious castle.
The word 'wchodzących' is used to depict the football teams that are coming into a certain place or position.