#include <bits/stdc++.h>
 
using namespace std;
 
int main(void)
{
	cin.tie(0);
	ios::sync_with_stdio(false);

  int n;

  cin >> n;

  while(n--)
  {
    string s;
    cin >> s;
    if(s=="0")
    {
      cout << 0 << '\n';
    }
    else
    {
      vector <int> v;
      for(auto it : s)
      {
        v.push_back(it-'0');
      }
      while(v.size()>1)
      {
        vector <int> v2;
        for(int i=0;i<v.size()-1;i++)
        {
          int val = v[i] + v[i+1];
          v2.push_back(val/10 + val%10);
        }
        v = v2;
      }
      cout << v[0] << '\n';
    }
  }
	return 0;
}