#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;
#ifdef _WIN32
#include <Windows.h>
#endif

int main()
{
    int n;
    string s, t;
    cin >> n;
    for (int i = 0; i < n; i++){
        cin >> s;
        while (s.size() > 1){
            string temp;
            for (int j = 0; j < s.size() - 1; j++){
                int t;
                t = (s[j] - '0') + (s[j+1] - '0');
                temp += ((t >= 10) ? t%10 + 1 + '0' : t + '0');
            }
            s = temp;
        }
        cout << s << endl;
    }
}