if len(s) > 0:  
    for i in range(len(s)):
        if s[i] != ' ':
            break
        else:
            i = 0
    for ii in range(len(s))[1:len(s)]:
        if s[-ii] != ' ':
            a = len(s)-ii+1
            break
        else:
            a = 0
    return s[i:a]
else:
    return ''