hello guys , i need some help, i have this msa file containing 1570 seqs i need to remove the gi numbers and retain the accession numbers please help:below is asample

gi|8393762|ref|np_058552.1|/1-782 mtsiiklttlsgvqeesalcyllqvdefrflldcgwdehfsvdiidslrkhvhqidavll gi|685228433|gb|aio05253.1|/1-482 gvwsgmvgtslsmliraelshpgmfigndqiynvivtahafimiffmvmpimiggfgnwl gi|685228539|gb|aio05306.1|/1-482 gvwsgmvgtslsmliraelshpgkfigndqiynvivtahafimiffmvmpimiggfgnwl

thanks willingtone