#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
using namespace std;

string solve(const string& s)
{
    int n = s.size();
    string t(n-1, ' ');
    for(int i=0; i<n-1; ++i){
        int a = (s[i] - '0') + (s[i+1] - '0');
        a = a / 10 + a % 10;
        t[i] = a + '0';
    }
    return t;
}

int main()
{
    int t;
    cin >> t;

    while(--t >= 0){
        string s;
        cin >> s;
        while(s.size() != 1)
            s = solve(s);
        cout << s << endl;
    }

    return 0;
}