#!/usr/bin/python
#-*- coding: latin-1 -*-

import os
import sys
import time

"""
"""

if __name__ == "__main__":
    """
    """
    try:
        num = int("3a")
        print no_existe
    except NameError:
        print "La variable no existe"
    except ValueError:
        print "El valor no es un numero"
