package yukicoder;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class N432
{
	public static void main(String[] args)throws IOException
	{
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		int T=Integer.parseInt(br.readLine());
		for(int i=0;i<T;i++)
		{
			String str=br.readLine();
			int[] s=new int[str.length()];
			for(int j=0;j<str.length();j++)
			{
				s[j]=Integer.parseInt(str.substring(j, j+1));
			}
			for(int j=1;j<str.length();j++)
			{
				for(int k=0;k<str.length()-j;k++)
				{
					s[k]=s[k]+s[k+1];
					if(s[k]>=10){s[k]=1+s[k]%10;}
				}
			}
			System.out.println(s[0]);

		}
	}

}