#include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int t;     cin >> t;     while (t--) {       int n;       cin >> n;       string s;       cin >> s;       int cnt = 0;       reverse(s.begin(), s.end());       cnt += (s[0] -  0 );       for (int i = 1; i < n; i++) {         if (s[i] !=  0 ) cnt = cnt + 1 + (s[i] -  0 );       }       cout << cnt <<   n ;     }   }   