vstupujícího
Vstupujícího is a Czech word that translates to "entering" or "incoming" in English. It is the genitive singular masculine form of the present active participle of the verb vstoupit, which means "to enter" or "to step in." This grammatical form is typically used after prepositions that govern the genitive case, such as "bez" (without), "kolem" (around), or "kromě" (besides).
For example, one might say "bez vstupujícího světla" which means "without the entering light," referring to light