#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int T; cin >> T;
    rep(_,T) {
        string s; cin >> s;
        while(int(s.size()) > 1) {
            string ns = "";
            rep(i,int(s.size())-1) {
                int a = s[i] - '0', b = s[i + 1] - '0';
                int x = a + b;
                if(x >= 10) x = x / 10 + x % 10;
                ns += char(x + '0');
            }
            swap(s, ns);
        }
        cout << s << endl;
    }
}