#include<bits/stdc++.h>
using namespace std;
using ll = long long;

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl

ll ctoi(char c){
    ll v = c - '0';
    return v;
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    ll T; cin >> T;

    while(T--){
        string s; cin >> s;
        vector<ll> A;
        for(char c : s){
            A.push_back(ctoi(c));
        }
        while(A.size()>1){
            vector<ll> B;
            FOR(i, 0, A.size()-1){
                ll v = A[i] + A[i+1];
                if(v>9){
                    v = v/10 + v%10;
                }
                B.push_back(v);
            }
            A = B;
        }
        p(A[0]);
    }
    
    return 0;
}