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In this talk we consider separable non-Galois extensions F/K of a global eld K. Let L be a Galois extension of K contaning F with G = Gal(L/K) and H = Gal(L/F). We will show that if G is a nite group of Lie type dened over F_q and H is a parabolic subgroup of G, then the number of primes of F lying over a tamely ramied place of K with given residue degree can be as polynomials in q This polynomials are determined by the length function on the certain subgroups of the Weyl group of G.