func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int arr[30] = {0};     unsigned long long sum = 0;     long long int a, b, n;     cin >> n;     for (int i = 0; i < n; i++) {       int j = 0;       cin >> a;       while (a != 0) {         b = a % 10;         arr[j] += b;         arr[j + 1] += b;         a /= 10;         j += 2;       }     }     for (unsigned long long int i = 0, ten = 1; i < 30; i++, ten = ten * 10) {       if (!arr[i]) continue;       arr[i] *= n;       unsigned long long x =           ((arr[i] % 998244353) * (ten % 998244353)) % 998244353;       sum = (sum + x) % 998244353;     }     cout << sum << endl;   }   