Someone

str=raw_input("Escriba: ")b=[]d=[]f=" "g=[]h=0c=list(str)for i in c:    a=i.upper()    e=i.lower()    if i==f:        g.append(`i`+`h`)    elif i==a:        b.append(`i`+`h`)    elif i==e:        d.append(`i`+`h`)    h+=1print bprint dprint g