It can suit every condition

I=words.split()
    i=0
    a=len(l)
    if a<3:
        t=False

    else:
        while i+2<a:
            if l[i].isalpha() and l[i+1].isalpha() and l[i+2].isalpha() :
                t=True
                break

            else:
                i=i+1
                t=False


    return t