import java.util.*;

public class Exercise156 {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int number = sc.nextInt();
    for(int i = 0; i < number; i++){
      System.out.println(calc(sc.nextLong()));
    }
  }
  public static String calc(Long num){
    String numStr = String.valueOf(num);
    while(Long.parseLong(numStr) > 9){
      char[] numArray = new char[numStr.length()];
      for(int i = 0; i < numStr.length(); i++){
        numArray[i] = numStr.charAt(i);
      }
      String str = "";
      for(int i = 0; i < numStr.length() - 1; i++){
        int x = Character.getNumericValue(numArray[i]) + Character.getNumericValue(numArray[i + 1]);
        if(x > 9){
          x = x - 10 + 1;
        }
        str = str + String.valueOf(x);
      }
      numStr = str;
    }
    return numStr;
  }
}