Where are Mendzlesh and Ciedcilys Poland? #poland

Dahn Cukier

I have reviewed again my grandmother (b.1904) and her older
brother Joel (b. 1882) Ellis Island and naturalization
papers, as being born in Ciedcilys and Mendzlesh
in Poland.
I do not find either city, town, village.
Does anyone know where they were located?
Thank you
Dahn Zukrowicz
Cukier, Lisabitzsky, Brieff, Sklawer and dozens of spelling variations.
When you start to read readin,
how do you know the fellow that
wrote the readin,
wrote the readin right?

Festus Hagen
Long Branch Saloon
Dodge City, Kansas

Maciej Łopaciński

It looks like a phonetic transcription. What region of Poland is it?

Just guessing

--- Ciedcilys - Siedlce ?

--- Mendzlesh - Międzyrzec Podlaski ?