fn main() {
    let _ : usize = input();
    let s : String = input();
    let s = s.chars().collect::<Vec<_>>();


    let t = [
        "yukicoder".chars().collect::<Vec<_>>(),
        "?ukicoder".chars().collect::<Vec<_>>(),
        "y?kicoder".chars().collect::<Vec<_>>(),
        "yu?icoder".chars().collect::<Vec<_>>(),
        "yuk?coder".chars().collect::<Vec<_>>(),
        "yuki?oder".chars().collect::<Vec<_>>(),
        "yukic?der".chars().collect::<Vec<_>>(),
        "yukico?er".chars().collect::<Vec<_>>(),
        "yukicod?r".chars().collect::<Vec<_>>(),
        "yukicode?".chars().collect::<Vec<_>>(),
    ];

    println!("{}", t.iter().map(|t| count(&s, t)).fold(0, |acc,v| (acc+v) % 1_000_000_007));
}

fn count(s:&Vec<char>, t:&Vec<char>) -> usize {
    let mut dp = vec![0; 11]; dp[0]=1;
    for i in 0..s.len() { for j in 0..9 {
        if s[i] == t[j] { dp[j+1] += dp[j]; dp[j+1] %= 1_000_000_007; }
    }}
    dp[9]
}



#[allow(dead_code)]
fn input<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

#[allow(dead_code)]
fn input_t<T: std::str::FromStr, U: std::str::FromStr>() -> (T, U) {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let s = s.trim().split_whitespace().collect::<Vec<&str>>();
    (s[0].parse().ok().unwrap(), s[1].parse().ok().unwrap())
}

#[allow(dead_code)]
fn input_t3<T1: std::str::FromStr, T2: std::str::FromStr, T3: std::str::FromStr>() -> (T1, T2, T3) {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let s = s.trim().split_whitespace().collect::<Vec<&str>>();
    (s[0].parse().ok().unwrap(), s[1].parse().ok().unwrap(), s[2].parse().ok().unwrap())
}

#[allow(dead_code)]
fn input_t4<T1: std::str::FromStr, T2: std::str::FromStr, T3: std::str::FromStr, T4: std::str::FromStr>() -> (T1, T2, T3, T4) {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let s = s.trim().split_whitespace().collect::<Vec<&str>>();
    (s[0].parse().ok().unwrap(), s[1].parse().ok().unwrap(), s[2].parse().ok().unwrap(), s[3].parse().ok().unwrap())
}

#[allow(dead_code)]
fn input_t5<T1: std::str::FromStr, T2: std::str::FromStr, T3: std::str::FromStr, T4: std::str::FromStr, T5: std::str::FromStr>() -> (T1, T2, T3, T4, T5) {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let s = s.trim().split_whitespace().collect::<Vec<&str>>();
    (s[0].parse().ok().unwrap(), s[1].parse().ok().unwrap(), s[2].parse().ok().unwrap(), s[3].parse().ok().unwrap(), s[4].parse().ok().unwrap())
}

#[allow(dead_code)]
fn input_vec<T: std::str::FromStr>() -> Vec<T> {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().split_whitespace().map(|s| s.parse().ok().unwrap()).collect()
}