fn paz(input: &str) -> IResult<&str, String>
    {
        terminated(map(many0(one_of("ABCDEFGHIJKLMNOPQRSTUVWYYZ")), |v| v.into_iter().collect::<String>()),
                   nom::character::complete::char(':'))(input)
    }
    #[test]
    fn test_az() {
        assert_eq!(paz("ABC:"), Ok(("", "ABC".to_string())));
    }