def separador(entrada):
resultado = ''
for caractere in entrada:
if caractere in '02468':
if len(resultado) > 0 and resultado[-1] in '02468':
resultado += '-'
resultado += caractere
return resultado
print(separador('02368859')) # 0-236-8-859
ZGVmIHNlcGFyYWRvcihlbnRyYWRhKToKICAgIHJlc3VsdGFkbyA9ICcnCgogICAgZm9yIGNhcmFjdGVyZSBpbiBlbnRyYWRhOgogICAgICAgIGlmIGNhcmFjdGVyZSBpbiAnMDI0NjgnOgogICAgICAgICAgICBpZiBsZW4ocmVzdWx0YWRvKSA+IDAgYW5kIHJlc3VsdGFkb1stMV0gaW4gJzAyNDY4JzoKICAgICAgICAgICAgICAgIHJlc3VsdGFkbyArPSAnLScKICAgICAgICByZXN1bHRhZG8gKz0gY2FyYWN0ZXJlCgogICAgcmV0dXJuIHJlc3VsdGFkbwoKcHJpbnQoc2VwYXJhZG9yKCcwMjM2ODg1OScpKSAgIyAwLTIzNi04LTg1OQ==