#include <cstdio>

 #include <string>

 #include <map>

 using namespace std;

 const int SIZE = ;

 const int value[] = {, , , , , , , , , , , , };

 const string sign[] = {"I", "IV", "V", "IX", "X", "XL", "L", "XC", "C", "CD", "D", "CM", "M"};

 int main()

 {

     map<string, int> dic;

     for (int n = ; n < ; n++)

     {

         int num = n;

         string Roman = "";

         for(int i = SIZE - ; i >=  && num; i--)

         {

             while(num >= value[i])

             {

                 Roman += sign[i];

                 num -= value[i];

             }

         }

         dic[Roman] = n;

     }

     char s[];

     while(gets(s))

     {

         if(s[] == '\0')

         {

             puts("");

             continue;

         }

         if(dic.count(s)) printf("%d\n", dic[s]);

         else printf("This is not a valid number\n");

     }

     return ;

 }