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