import java.util.Scanner;
class B{
	static Scanner s = new Scanner(System.in);
	public static void main(String[] args) {
		int[] b = new int[1000];
		int end,buf;
		s.next();
		while(s.hasNext()){
			String in = s.next();
			for(int i=0; i<in.length(); i++) {
				b[i] = Integer.parseInt(String.valueOf(in.charAt(i)));
			}
			end = in.length();
			while(end!=1) {
				for(int i=0; i<end-1; i++) {
					buf = b[i]+b[i+1];
					b[i]=buf%10+buf/10;
				}
				end--;
			}
			System.out.println(b[0]);
		}
	}
}