Python - eliminar palabra con caracter repetidos

palabra = input("Introduzca palabra: ")

ultima = ''

for letra in palabra:

    if letra == ultima:

        print('Letra repetida:', letra)

    ultima = letra

c="picoo,       ppiedra,      casa,   julio    peedro ,    vaca    ,  ratonn"

K=0

P=[]

for i in range(len(c)):

   P.append(len(c))

for i in range(len(c)):

    if c[i]==' ':

        P[K]=i

        K=K+1

k=0

u=0

V= ''

cont=0

print(c)

while  u<=K-1:

     N=[];

     if u==0:

        t=0

        for i in range(P[u]):

            N.append(P[u])

        for  i in range(P[u]):

            if c[i]!=c[i+1]:

               N[t]=c[i]

               t=t+1

            else:

               N=[]

               break

        N="".join(N)

        if i+1==P[u]:

           cont=cont+1;

     elif (u<K-1 and u>0):

        t=0

        for i in range(P[u+1]-P[u]-1):

            N.append(P[u+1]-P[u]-1)

        for  i in range(P[u]+1,P[u+1]):

            if c[i]!=c[i+1]:

               N[t]=c[i]

               t=t+1

            else:

               N=[]

               break

        N="".join(N)

        if i+1==P[u+1]:

           cont=cont+1;

     elif u==K-1:

        t=0

        for i in range(len(c)-1-P[u]):

            N.append(len(c)-1-P[u])

        for  i in range(P[u]+1,len(c)-1):

            if c[i]!=c[i+1]:

               N[t]=c[i]

               t=t+1

               if i+2==len(c):

                   N[t]=c[i+1]

            else:

               N=[]

               break

        N="".join(N)

        if i+1==len(c)-1:

           cont=cont+1;

     V=V+N+''

     k=k+1

     u=u+1

print(V)

E:\PYTHON 2020>python eliminar_palabras_repetidas.py

picoo,       ppiedra,      casa,   julio    peedro ,    vaca    ,  ratonn

casa,julio,vaca,