#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;
using mint=modint998244353;
int main()
{
    ll m;
    cin>>m;
    string s;
    cin>>s;
    int n=s.size();
    mint ss=1;
    for(int i=0;i<n;i++){
        mint x=m/10;
        if((s[i]-'0')<m%10)x++;
        ss*=x;
    }
    mint ans=0;
    mint t=1;
    reverse(s.begin(),s.end());
    for(int i=0;i<n;i++){
        mint x=m/10;
        if((s[i]-'0')<m%10)x++;
        ans+=ss/x*((s[i]-'0')*x+5*x*(x-1))*t;
        t*=m;
    }
    cout<<ans.val()<<endl;
    
    return 0;
}