#include<stdio.h>
int main()
{
    int n1,n2,n3;
    scanf("%d %d %d",&n1,&n2,&n3);
    if(n1<0||n2<0||n3<0)
    {
      printf("Invalid Input\n");
    }
     else 
     {
         if(n1==n2 && n2==n3)
         {
             printf("Equilateral\n");
         }
         else if(n1==n2||n1==n3||n2==n3)
         {
             printf("Isosceless\n");
         }
         else 
         { 
             printf("Scalene\n");
         }
}
    return 0;