#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;

string nstr(){
    static const int MAX_LEN = 1000000;
    static char res_[MAX_LEN];
    scanf("%s",res_);
    return string(res_);
}

string S;

void solve() {
    vi v(sz(S)), u(sz(S));
    int n = sz(S);
    rep(i, n)v[i] = S[i] - '0';
    while(sz(v) > 1) {
        rep(i, sz(v) - 1) {
            u[i] = v[i] + v[i + 1];
            if(u[i] >= 10) {
                u[i] = u[i] / 10 + u[i] % 10;
            }
        }
        u.pop_back();
        v.pop_back();
        
        swap(u, v);
    }
    printf("%d\n", v[0]);
}

int main(){
    int T; cin >> T;
    while(T--) {
        S = nstr();
        solve();
    }
}