#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  int t;
  cin >> t;
  while (t--) {
    string a;
    cin >> a;
    while (a.size() > 1) {
      string b = "";
      rep(i, a.size() - 1) {
        int x = a[i] - '0' + a[i + 1] - '0';
        if (x >= 10) x = x / 10 + x % 10;
        b += x + '0';
      }
      swap(a, b);
    }
    cout << a << endl;
  }
  return 0;
}