Quark helicity distributions from DIS and SIDIS at COMPASS

The COMPASS collaboration at CERN is measuring the spin structures of nucleon. At this meeting we will present the inclusive asymmetry A$_{1,d }$and the semi-inclusive asymmetries A$_{1,d}^{pi+}$, A$_{1,d}^{pi-}$ ,A$_{1,d}^{K+}$, A$_{1,d}^{K-}$measured in the polarized deep inelastic muon-deuteron scattering. The data cover the range Q$^{2}>$1GeV$^{2}$ and 0.004 $<$x$<$0.3. These results were obtained from the data collected in years 2002-2004 and 2006. We will also present the valence, non-strange sea and strange quark helicity distributions extracted from the LO analysis using these results. The strange quark distribution is compatible with zero in the whole measured range.