def trim(s):    if isinstance(s,str):        if s[0]==' '&s[-1]!=' ':            s=s[1:]        elif s[0]==' '&s[-1]==' ':            s=s[1:-1]        elif s[0]!=' '&s[-1]==' ':            s=[:-1]        else:            s=s[:]    else:        print('The input is not a str')return s