#include <iostream>
#include <vector>

using namespace std;

int main() {
    int t;
    cin >> t;
    vector<string> s(t);
    int ans[t];
    for(int i=0;i<t;i++)
        cin >> s[i];

    for(int i=0;i<t;i++) {
        string str = s[i];
        string result = s[i];
        while(result.size()>1) {
            result = "";
            for(int j=0;j<str.size()-1;j++) {
                int _a = int(str[j]-'0') + int(str[j+1]-'0');
                int a = _a % 10 + _a / 10;
                result += to_string(a);
            }
            str = result;
        }
        cout << result << endl;
    }
}