#include <algorithm>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <iostream>
#include <map>
#include <memory>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <utility>
#include <vector>

using namespace std;

typedef long long ll;

#define sz size()
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define all(c) (c).begin(), (c).end()
#define rep(i,a,b) for(ll i=(a);i<(b);++i)
#define clr(a, b) memset((a), (b) ,sizeof(a))
#define ctos(c) string(1,c)
#define print(x) cout<<#x<<" = "<<x<<endl;

#define MOD 1000000007

int main() {
	ll T;
	cin>>T;
	rep(i,0,T){
		string s;
		cin>>s;
		vector<ll> v;
		rep(j,0,s.sz){
			v.pb(s[j]-'0');
		}
		while(1){
			if(v.sz==1)break;
			vector<ll> v1;
			rep(j,0,v.sz-1){
				ll a = v[j]+v[j+1];
				v1.pb(a%10+a/10);
			}
			v = v1;
		}
		cout << v[0] << endl;
	}
	return 0;
}