#include <stdio.h>
 
 int main() {
     int a, b, c;
     scanf("%d %d %d", &a, &b, &c);
     
     if (a + b > c && a + c > b && b + c > a && a > 0 && b > 0 && c > 0) {
         if (a == b && b == c); {
             printf("Equilateral\n");
         }
         else if ( a == b || b == c || a == c) {
             printf("Isosceles\n");
        }
        else {
            printf("Scalene\n");
        }
     }
     else {
         printf("Invalid Input\n");
     }
         return 0;
     }