#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define F first
#define S second
#define pii pair<int, int>
#define eb emplace_back
#define all(v) v.begin(), v.end()
#define rep(i, n) for (int i = 0; i < n; ++i)
#define rep3(i, l, n) for (int i = l; i < n; ++i)
#define chmax(a, b) a = (a >= b ? a : b)
#define chmin(a, b) a = (a <= b ? a : b)
#define out(a) cout << a << endl
#define outa(a, n) rep(_, n) cout << a[_] << " "; cout << endl
#define SZ(v) (int)v.size()
#define inf (int)(1e9+7)
#define abs(x) (x >= 0 ? x : -(x))
#define ceil(a, b) a / b + !!(a % b)

int main() {
    // 4. 和が10以上かに関わらず置き換える
    int t;
    cin >> t;
    rep(i, t) {
        string s;
        cin >> s;
        while (1) {
            if (SZ(s) == 1) { out(s); break; }
            string ss;
            rep(i, SZ(s) - 1) {
                int tmp;
                tmp = s[i] - '0' + s[i + 1] - '0';
                if (tmp >= 10) {
                    tmp = tmp / 10 + tmp % 10;
                }
                // out("tmp " << tmp);
                ss += tmp + '0';
            }
            s = ss;
            // out(s);
        }
    }
    
}