// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
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_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_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 ----------

fn run() {
    input! {
        _n: usize,
        s: bytes,
    }
    const MOD: u64 = 1_000_000_007;
    let calc = |t: &[u8]| -> u64 {
        let mut dp = vec![0; t.len() + 1];
        dp[0] = 1;
        for s in s.iter() {
            for (j, t) in t.iter().enumerate().rev() {
                if *s == *t {
                    dp[j + 1] += dp[j];
                }
            }
            dp.iter_mut().for_each(|dp| *dp %= MOD);
        }
        dp[t.len()]
    };
    let yuki = "yukicoder".bytes().collect::<Vec<_>>();
    let mut ans = calc(&yuki);
    for i in 0..yuki.len() {
        let mut y = yuki.clone();
        y[i] = b'?';
        ans += calc(&y);
    }
    ans %= MOD;
    println!("{}", ans);
}

fn main() {
    run();
}