Hi Zeynab

there are some ways to do that, the easiest for you would be to go to dbsnp (https://www.ncbi.nlm.nih.gov/snp/) and download the whole dataset and trim this data on your own snp list.

the FTP downloaded files appears as that:

chr1 33625174 33625175 rs4045806 0 +

chr1 33625240 33625241 rs4045807 0 +

chr1 33614867 33614868 rs4045808 0 -

chr1 33614835 33614836 rs4045809 0 -

chr1 33614828 33614829 rs4045810 0 -

chr1 154571174 154571174 rs4045821 0 +

chr1 35729936 35729936 rs4045852 0 +

chr1 33553551 33553552 rs4045854 0 -

all the best

fred