#include <iostream>
#include <vector>
#include <string>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <random>
#include <stdio.h>
#include <fstream>
#include <functional>
#include <cassert>
#include <unordered_map>
#include <bitset>
#include <atcoder/all>

using namespace std;
using namespace atcoder;



#define rep(i,n) for (int i=0;i<n;i+=1)
#define rrep(i,n) for (int i=n-1;i>-1;i--)
#define pb push_back
#define all(x) (x).begin(), (x).end()

template<class T>
using vec = vector<T>;
template<class T>
using vvec = vec<vec<T>>;
template<class T>
using vvvec = vec<vvec<T>>;
using ll = long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;




template<class T>
bool chmin(T &a, T b){
  if (a>b){
    a = b;
    return true;
  }
  return false;
}

template<class T>
bool chmax(T &a, T b){
  if (a<b){
    a = b;
    return true;
  }
  return false;
}

template<class T>
T sum(vec<T> x){
  T res=0;
  for (auto e:x){
    res += e;
  }
  return res;
}

template<class T>
void printv(vec<T> x){
  for (auto e:x){
    cout<<e<<" ";
  }
  cout<<endl;
}

template<class T>
ostream& operator<<(ostream& os, const vec<T>& A){
  os << "{";
  rep(i,A.size()){
    os << A[i];
    if (i!=A.size()-1){
      os << ' ';
    }
  }
  os<<"}";
  return os;
}

template<class T,class U>
ostream& operator<<(ostream& os, const pair<T,U>& A){
  os << "(" << A.first <<", " << A.second << ")";
  return os;
}

template<class T>
ostream& operator<<(ostream& os, const deque<T>& A){
  os << "deque({";
  rep(i,A.size()){
    os << A[i];
    if (i!=A.size()-1){
      os << ' ';
    }
  }
  os<<"})";
  return os;
}

int pow(int a, int b, int mod){
  int res = 1;
  while (b){
    if (b&1){
      res = res * a % mod;
    }
    a = a * a % mod;
    b >>= 1;
  }
  return res;
}

using mint = modint998244353;

const mint i10 = mint(10).inv();

ostream& operator<<(ostream& os, const mint& a){
  os << a.val();
  return os;
}

int main(){
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);

  int N;
  cin>>N;
  string S;
  cin>>S;

  vec<mint> tmp(3,0);
  mint res = 0;
  rep(i,N){
    vec<mint> c(3);
    if (S[i]=='?'){
      c[0] = 4;
      c[1] = 3;
      c[2] = 3;
    }
    else{
      c[int(S[i])%3] = 1;
    }
    vec<mint> ntmp(3);
    rep(r,3){
      rep(rr,3){
        ntmp[(r+rr)%3] += tmp[r] * c[rr];
      }
    }
    rep(r,3){
      ntmp[r] += c[r];
    }
    swap(tmp,ntmp);
    res += tmp[0];
    //cout << tmp << endl;
    //cout << res << endl;
  }

  cout << res.val() << endl;

  

  

  
  

  
}