import java.util.*;
public class Main {
  static String[] WDAYS = new String[] { "SUN","SAT","FRI","THU","WED","TUE","MON" };
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String a = sc.next();
    for (int i = 0; i < WDAYS.length; i++) {
      if (a.equals(WDAYS[i])) {
        System.out.println(i == 0 ? 7 : i);
        return;
      }
    }
    System.out.println(-1);
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz