const MOD: usize = 1e9 as usize + 7;

fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let s = s.trim().chars().collect::<Vec<char>>();

    let LIMIT = 10;
    let mut dp = vec![vec![vec![0usize; LIMIT]; 2]; n+1];
    dp[0][0][0] = 1;
    for i in 0..n {
        for pat in 0..2 {
            for j in 0..LIMIT {
                dp[i+1][pat][j] += dp[i][pat][j];
            }
            match s[i] {
                'y' => { dp[i+1][pat][1]  += dp[i][pat][0]; dp[i+1][pat][1]  %= MOD; },
                'u' => { dp[i+1][pat][2]  += dp[i][pat][1]; dp[i+1][pat][2]  %= MOD; },
                'k' => { dp[i+1][pat][3]  += dp[i][pat][2]; dp[i+1][pat][3]  %= MOD; },
                'i' => { dp[i+1][pat][4]  += dp[i][pat][3]; dp[i+1][pat][4]  %= MOD; },
                'c' => { dp[i+1][pat][5]  += dp[i][pat][4]; dp[i+1][pat][5]  %= MOD; },
                'o' => { dp[i+1][pat][6]  += dp[i][pat][5]; dp[i+1][pat][6]  %= MOD; },
                'd' => { dp[i+1][pat][7]  += dp[i][pat][6]; dp[i+1][pat][7]  %= MOD; },
                'e' => { dp[i+1][pat][8]  += dp[i][pat][7]; dp[i+1][pat][8]  %= MOD; },
                'r' => { dp[i+1][pat][9]  += dp[i][pat][8]; dp[i+1][pat][9]  %= MOD; },
                '?' => {
                    if pat == 0 {
                        for k in 0..LIMIT-1 {
                            dp[i+1][pat+1][k+1] += dp[i][pat][k];
                            dp[i+1][pat+1][k+1] %= MOD;
                        }
                    }
                    dp[i+1][1][0] = 25;
                },
                _ => {},
            };
        }
        
    }
    println!("{}", (dp[n][0][LIMIT-1] + dp[n][1][LIMIT-1]) % MOD);
}