#get 8 Ap-indexes from the rest of line
    apidx  =[]
    for i in xrange(28, 28+3*8,3):
        atmp =s[i:i+3]
        if not atmp.strip().isdigit():
            print 'ERROR:'
            print 'The Ap-index value is invalid - contains not digits.'
            print 'The invalid value is ', atmp
            print 'in the string ', s
            sys.exit(5)
        apidx.append(atmp)
        del atmp