import java.io.*;
import java.util.*;

public class Main {
    static final int MOD = 998244353;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        char[] values = sc.next().toCharArray();
        int[] dp = new int[3];
        int ans = 0;
        for (int i = 0; i < n; i++) {
            int[] next = new int[3];
            if (values[i] == '?') {
                for (int j = 0; j < 10; j++) {
                    for (int k = 0; k < 3; k++) {
                        next[(k * 10 + j) % 3] += dp[k];
                        next[(k * 10 + j) % 3] %= MOD;
                    }
                    next[j % 3]++;
                }
            } else {
                for (int j = 0; j < 3; j++) {
                    next[(j * 10 + values[i] - '0') % 3] += dp[j];
                    next[(j * 10 + values[i] - '0') % 3] %= MOD;
                }
                next[(values[i] - '0') % 3]++;
            }
            ans += next[0];
            ans %= MOD;
            dp = next;
        }
        System.out.println(ans);
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}