  We report synthesis, crystal structure and physical properties of a quinary
iron-arsenide fluoride KCa$_2$Fe$_4$As$_4$F$_2$. The new compound crystallizes
in a body-centered tetragonal lattice (with space group $I4/mmm$, $a$ =
3.8684(2) {\AA}, c = 31.007(1) {\AA}, and $Z$ = 2), which contains double
Fe$_2$As$_2$ conducting layers separated by insulating Ca$_2$F$_2$ layers. Our
measurements of electrical resistivity, dc magnetic susceptibility and heat
capacity demonstrate bulk superconductivity at 33 K in
KCa$_2$Fe$_4$As$_4$F$_2$.
