fn main() {
    input! {
        t: usize,
        ask: [(usize, chars); t],
    }
    for (n, s) in ask {
        let mut ans = vec!['z'; n + 1];
        let p = "helloworld";
        for (i, a) in s.windows(p.len()).enumerate() {
            if a.iter().zip(p.chars()).all(|(a, b)| *a == b || *a == '?') {
                let mut s = s.clone();
                for (j, c) in p.chars().enumerate() {
                    s[i + j] = c;
                }
                for s in s.iter_mut() {
                    if *s == '?' {
                        *s = 'a';
                    }
                }
                ans = std::cmp::min(ans, s);
            }
        }
        if ans.len() == n + 1 {
            println!("-1");
        } else {
            let ans = ans.into_iter().collect::<String>();
            println!("{}", ans);
        }
    }
}

// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
#[macro_export]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

#[macro_export]
macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};
    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

#[macro_export]
macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}
// ---------- end input macro ----------