import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        for(int i=0; i<N; i++){
            String S = sc.next();
            while( S.length()!=1 ){
                String [] arr = S.split("");
                S="";
                for(int j=1; j<arr.length; j++){
                    int r = Integer.parseInt(arr[j-1]) + Integer.parseInt(arr[j]);
                    if(r>=10){
                        r=r/10+r%10;
                    }
                    S=S+r;
                }
            }
            System.out.println(S);
        }
    }
}