Crear diccionario de lista 2D
d = {}
for elem in l:
if elem[1] in d:
d[elem[1]].append(elem[0])
else:
d[elem[1]] = [elem[0]]
Alert Ape
d = {}
for elem in l:
if elem[1] in d:
d[elem[1]].append(elem[0])
else:
d[elem[1]] = [elem[0]]